Grade - Tonnage Curve
Grade - Tonnage Curve
Figure 1:
Geologic Plan of the Adumbi Deposit
Figure 2:
Adumbi Longitudinal Section Looking Northeast with Drill Hole (Grade x Metre)
Figure 3:
Geological Cross Section A-B
Figure 4:
Grade Block Model Cross Section A-B
Figure 5:
Geological Cross Section C-D
Figure 6:
Grade Block Model Cross Section C-D
Figure 7:
3-D mineralised model showing the April 2021 and the November 2021 pit shells
- Indicated mineral resource of 1.88 million ounces of gold (28.185 million tonnes grading 2.08 g/t gold)
- Inferred mineral resource of 1.78 million ounces of gold (20.828 million tonnes grading 2.65 g/t gold) within US$1,600/oz pit shell
TORONTO, Nov. 17, 2021 (GLOBE NEWSWIRE) -- Loncor Gold Inc. ("Loncor" or the "Company") (TSX: "LN"; OTCQX: "LONCF"; FSE: "LO51") is pleased to announce an increase and upgrade in mineral resources at its Adumbi deposit in the Imbo Project (Loncor 84.68%) in the D.R. Congo.
Compared to the inferred mineral resource of 3.15 million ounces of gold (41.316 million tonnes grading 2.37 g/t Au) outlined in April 2021 (see Company press release dated April 27, 2021), the additional drilling information and the increased gold price used, have contributed significantly to the increased mineral resources of the Adumbi deposit with improved confidence to 1.88 million ounces of gold in the indicated category and 1.78 million ounces of gold in the inferred category. 84.68% of these mineral resources are attributable to Loncor via its 84.68% interest in the Imbo Project.
Table I below summarises the Adumbi indicated and inferred mineral resources based on in-situ block cut-off grade at a 0.52 g/t Au for Oxide, 0.57 g/t Au for Transition and 0.63 g/t Au for Fresh material, and constrained within a US$1,600 per ounce optimized pit shell.
Table I: Adumbi Deposit Indicated and Inferred Mineral Resources
(effective date: November 17, 2021)
Mineral Resource Category | Tonnage (Tonnes)
| Grade (g/t Au)
| Contained Gold (Ounces)
|
Indicated | 28,185,000 | 2.08 | 1,883,000 |
Inferred | 20,828,000 | 2.65 | 1,777,000 |
Note: Numbers may not add up due to rounding.
Tables II below summarise the indicated and inferred category mineral resources in terms of material type.
Table II: Adumbi Mineral Resources by Material Type
(effective date: November 17, 2021)
| INDICATED MINERAL RESOURCE | INFERRED MINERAL RESOURCE |
| Tonnage | Grade | Contained Gold | Tonnage | Grade | Contained Gold
|
Material Type | (Tonnes) | (g/t Au) | (Ounces) | (Tonnes) | (g/t Au) | (Ounces) |
Oxide | 3,169,000 | 2.05 | 208,000 | 458,000 | 3.39 | 49,000 |
Transitional | 3,401,000 | 2.51 | 274,000 | 280,000 | 2.74 | 24,000 |
Fresh (Sulphide) | 21,614,000 | 2.02 | 1,400,000 | 20,089,000 | 2.64 | 1,703,000 |
TOTAL | 28,185,000 | 2.08 | 1,883,000 | 20,828,000 | 2.65 | 1,777,000 |
Note: Numbers may not add up due to rounding.
Commenting on today's mineral resource increase and upgrade at Adumbi, Loncor's President Peter Cowley said: "This increase in mineral resources within a US$1,600 pit shell to 3.66 million ounces of gold includes an indicated mineral resource of 1.88 million ounces of gold and was achieved by infill drilling the shallower part of the Adumbi deposit. Compared to the previous resource estimate in April 2021, the indicated and inferred tonnages, grades and ounces for this resource update, are expected and relate to drilling density and increasing gold grades with depth at Adumbi (see Company press release dated April 27, 2021-Table III). Gold mineralization is still open at depth below the pit shell where the favourable banded ironstone formation host ("BIF") is thickening and demonstrates potential for additional underground mineral resources. The mineral resources within the pit shell will be incorporated into the Preliminary Economic Assessment ("PEA") which the Company is undertaking to determine the economic viability of Adumbi and which is due for completion in December this year."
This mineral resource assessment was undertaken by the Company's independent geological consultants Minecon Resources and Services Limited ("Minecon"). The updated estimate for Adumbi was based on the additional drilling and a review of the Adumbi deposit including remodelling and grade estimation and considering the CIM requirement for mineral resources to have "reasonable prospects for economic extraction".
Drilling Results included in Mineral Resource Update
An additional fourteen core holes totaling 6,362.59 metres were drilled with the focus in areas within the pit shell where insufficient drilling had been undertaken to outline mineral resources. The upper part of the open pit shell was drilled at closer spacing in order to upgrade mineral resources from the inferred to indicated category.
Table III below summarises the significant intercepts of the additional drillholes that were included in this November 2021 mineral resource:
Table III: Core Hole Results from 2021 Drilling Program
Borehole | From (m) | To (m) | Intercept Width (m) | Grade (g/t) Au |
LADD009 | 559.76 | 564.76 | 5.00 | 3.17 |
LADD009 | 581.90 | 614.05 | 32.15 | 6.17 |
LADD009 including | 599.05 | 600.51 | 1.46 | 94.77 |
LADD009 | 629.56 | 644.92 | 15.36 | 3.73 |
LADD009 including | 632.00 | 637.89 | 5.89 | 6.56 |
LADD009 | 650.50 | 657.95 | 7.45 | 1.48 |
LADD012 | 784.35 | 797.80 | 13.45 | 3.63 |
LADD012 including | 784.35 | 786.35 | 2.00 | 9.56 |
LADD012 | 806.30 | 810.35 | 4.05 | 4.73 |
LADD012 | 784.35 | 797.80 | 13.45 | 3.63 |
LADD013 | 394.06 | 401.10 | 7.04 | 2.68 |
LADD013 | 418.65 | 438.65 | 20.00 | 4.21 |
LADD013 including | 419.75 | 430.75 | 11.0 | 6.91 |
LADD013 | 452.30 | 469.60 | 17.30 | 2.48 |
LADD013 including | 457.35 | 465.55 | 8.20 | 4.71 |
LADD014 | 670.00 | 681.80 | 11.80 | 2.97 |
LADD014 including | 670.00 | 673.53 | 3.53 | 6.44 |
LADD015 | 24.43 | 31.50 | 6.07 | 1.77 |
LADD016 | 672.85 | 680.94 | 8.09 | 1.90 |
LADD016 | 731.51 | 757.10 | 25.59 | 2.39 |
including | 737.18 | 743.27 | 6.09 | 4.78 |
including | 749.67 | 752.56 | 2.89 | 4.98 |
LADD016 | 672.85 | 680.94 | 8.09 | 1.90 |
LADD017 | 45.55 | 62.70 | 17.15 | 1.90 |
LADD017 | 92.68 | 118.45 | 25.77 | 6.24 |
LADD017 including | 100.76 | 110.05 | 9.29 | 9.68 |
LADD017 including | 112.95 | 118.45 | 5.50 | 9.75 |
LADD018 | 93.34 | 113.70 | 20.36 | 0.93 |
LADD018 | 152.48 | 178.20 | 25.72 | 2.26 |
LADD019 | 4.57 | 11.60 | 7.03 | 2.13 |
LADD021 | 75.21 | 88.17 | 12.96 | 2.09 |
LADD021 | 99.74 | 106.00 | 6.26 | 1.09 |
LADD021 | 144.78 | 160.51 | 15.73 | 5.28 |
LADD021 including | 144.78 | 149.78 | 5.00 | 13.70 |
LADD022 | 20.50 | 42.00 | 21.50 | 2.23 |
LADD022 including | 25.50 | 34.00 | 8.50 | 4.23 |
LADD023 | 227.10 | 261.73 | 34.63 | 3.12 |
LADD023 including | 231.65 | 237.40 | 5.75 | 7.23 |
LADD023 including | 248.10 | 255.25 | 7.15 | 5.55 |
LADD023 | 270.43 | 300.25 | 29.82 | 1.77 |
LADD024 | 216.15 | 227.65 | 11.50 | 3.47 |
LADD024 including | 224.10 | 227.65 | 3.55 | 7.79 |
LADD024 | 235.97 | 253.75 | 17.78 | 3.20 |
LADD025 | 258.38 | 266.00 | 7.62 | 1.16 |
LADD025 | 279.50 | 286.35 | 6.85 | 3.44 |
LADD025 | 301.10 | 311.57 | 10.47 | 1.74 |
LADD025 | 321.60 | 336.20 | 14.60 | 2.11 |
LADD025 | 342.65 | 361.75 | 19.10 | 4.11 |
LADD025 including | 349.00 | 357.75 | 8.75 | 5.40 |
Note: 1. It is estimated that the true widths of the mineralised sections for core holes LADD009, LADD012, LADD013, LADD014, LADD015, LDD016, LADD017, LADD018, LADD019, LADD021, LADD022, LADD023, LADD024 and LADD025 are, respectively, 82%, 86%, 85%, 78%, 65%, 69%, 71%, 75%, 65%, 73% 58%, 76%, 77% and 78% of the intercepted widths in the above table.
Core Logging & Geological Controls
Gold mineralization at Adumbi is found within a BIF (Banded Iron Formation) unit with a strike length of 850 metres and up to 130 metres in thickness (see Figures 1, 3, 5 below: Geologic Plan and Geologic Cross Sections of the Adumbi Deposit). Four main zones of gold mineralization are present within the BIF and are located in:
- the upper part of the Upper BIF Sequence,
- the lower part of the Upper BIF Sequence separated by the Carbonaceous Marker, which is essentially unmineralized, and
- within the Lower BIF Sequence.
There is a higher-grade zone of gold mineralization termed the Replaced Rock Zone ("RP Zone") associated with alteration and structural deformation that has destroyed the primary host BIF fabric. The RP Zone occurs in the lower part of the Upper BIF and in the Lower BIF, and transgresses the Carbonaceous Marker, located between the Upper and Lower BIF zones, both along strike and down dip.
Geological Modelling and Grade Estimation
The Adumbi 3-dimensional model was constructed by Minecon in collaboration with on site geologists using cross sectional and horizontal flysch plans of the geology and mineralization and was used to assist in the constraining of the 3-D geological model. The mineralization model was constrained within a wireframe at 0.5 g/t Au cut-off grade. Grade interpolation was undertaken using:
- 2 metre sample composites capped at 18 g/t Au to improve the reliability of the block grade estimates.
- Ordinary Kriging to interpolate grades into the block model.
- Relative densities of 2.45 for oxide, 2.82 for transitional and 3.05 for fresh rock were applied to the block model for tonnage estimation.
Pit Optimisation Parameters
To constrain the depth extent of the geological model and any mineral resources, an open pit for the Adumbi deposit was constructed based on the following pit optimisation parameters:
- A gold price of US$1,600 per ounce.
- Block size: 16 metres x 16 metres x 8 metres.
- A thirty-two metres minimum mining width and a maximum of four metres of internal waste was applied.
- Mining dilution of 100% of the tonnes at 95% of the grade.
- Ultimate slope angle of minus 45 degrees.
- Metallurgical recoveries of 91% for oxide, 88% for transitional and 90% for sulphide (based on diagnostic metallurgical testwork as part of PEA).
- Average mining cost of US$3.29/tonne mined.
- Average processing cost of US$17.81/tonne for oxides, US$18.92/tonne for transitional and US$22.13/tonne for sulphide.
- Average general and administration cost of US$4.20/tonne.
- Mineral resources were estimated at a block cut-off grade of 0.52 g/t Au for oxide, 0.57 g/t Au for transition materials and 0.63 g/t Au for fresh material constrained by a US$1,600 per ounce optimized pit shell (see Figures 4, 6 and 7 below).
- Transport of gold and refining costs equivalent to 4.5% of the gold price.
- No additional studies on depletion by artisanal activity was undertaken since the RPA study of 2014 and the same total amount of material was used by Minecon.
Tonnage/Grade Curve
Grade/tonnage curves for the Adumbi mineral resources at various gold cut-offs are summarised in Table IV and the graph below:
Table IV: Adumbi Mineral Resources at various gold cut-offs
Block Cut-off | Tonnage | Grade | Contained Au |
g/t Au | million tonnes | g/t Au | million ounces |
0.0 | 51.60 | 2.23 | 3.70 |
0.5 | 50.10 | 2.29 | 3.68 |
1.0 | 41.15 | 2.61 | 3.45 |
1.5 | 29.07 | 3.17 | 2.97 |
2.0 | 21.76 | 3.66 | 2.56 |
2.5 | 16.06 | 4.17 | 2.15 |
3.0 | 12.12 | 4.63 | 1.80 |
The Grade - Tonnage Curve accompanying this table is available at https://www.globenewswire.com/NewsRoom/AttachmentNg/2221a72e-698f-4295-8242-9c3fdb344163
The Adumbi deposit is found within Loncor's Imbo Project, which contains two other deposits, Kitenge and Manzako. As a result of the increased mineral resources at Adumbi, the total inferred mineral resource of the Imbo Project is now 2.09 million ounces of gold (22.508 million tonnes grading 2.89 g/t Au) and is summarised in Table V below. 84.68% of this inferred mineral resource is attributable to Loncor via its 84.68% interest in the Imbo Project.
Table V: Inferred Mineral Resource for the Imbo Project (effective date: November 17, 2021)
Deposit | Tonnage (Tonnes)
| Grade (g/t Au) | Contained Gold (Ounces) |
Adumbi | 20,828,000 | 2.65 | 1,777,000 |
Kitenge | 910,000 | 6.60 | 191,000 |
Manzako | 770,000 | 5.00 | 122,000 |
TOTAL | 22,508,000 | 2.89 | 2,090,000 |
Note: Numbers may not add up due to rounding.
Combined with the Company's Makapela Project, which is situated approximately 50 kilometres northwest of the Imbo Project, total mineral resources at Loncor's properties in the Ngayu belt now stand at 2.497 million ounces of indicated mineral resources (30.390 million tonnes grading 2.56 g/t Au) and 2.639 million ounces of inferred mineral resources (25.731 million tonnes grading 3.19 g/t Au) as summarised in Table VI below:
Table VI: Indicated and Inferred Mineral Resources on Loncor Properties in the Ngayu Belt (effective date: November 17, 2021).
Mineral Resource Category | Tonnage (Tonnes)
| Grade (g/t Au)
| Contained Gold (Ounces)
|
Indicated | 30,390,000 | 2.56 | 2,497.000 |
Inferred | 25,731,000 | 3.19 | 2,639,000 |
Note: Numbers may not add up due to rounding.
Quality Control and Quality Assurance
Drill cores for assaying were taken at a maximum of one-metre intervals and were cut with a diamond saw, with one-half of the core placed in sealed bags by Company geologists and sent to the Company's on-site sample preparation facility. The core samples were then crushed down to 80% passing minus 2 mm and split with one half of the sample up to 1.5 kg pulverized down to 90% passing 75 microns. Approximately 150 grams of the pulverized sample was then sent to the SGS Laboratory in Mwanza, Tanzania (independent of the Company). Gold analyses were carried out on 50g aliquots by fire assay. In addition, check assays were also carried out by the screen fire assay method to verify high-grade sample assays obtained initially by fire assay. As part of the Company's QA/QC procedures, internationally recognized standards, blanks and duplicates were inserted into the sample batches prior to submitting to SGS Laboratory.
Qualified Person
Mr. Daniel Bansah, Chairman and Managing Director of Minecon, is the "qualified person" (as such term is defined in National Instrument 43-101) who is responsible for the mineral resource estimates and other technical information disclosed in this press release. Mr. Bansah has reviewed and approved the contents of this press release.
Figures accompanying this announcement are available at:
Figure 1: Geologic Plan of the Adumbi Deposit
https://www.globenewswire.com/NewsRoom/AttachmentNg/71805815-e77c-48ef-9387-3bca872a416a
Figure 2: Adumbi Longitudinal Section Looking Northeast with Drill Hole (Grade x Metre)https://www.globenewswire.com/NewsRoom/AttachmentNg/381367ec-0cd0-42f8-a3db-3a9f3f786ac9
Figure 3: Geological Cross Section A-Bhttps://www.globenewswire.com/NewsRoom/AttachmentNg/02c27033-ce38-49ba-af3b-828c12b9425b
Figure 4: Grade Block Model Cross Section A-Bhttps://www.globenewswire.com/NewsRoom/AttachmentNg/3bf8f0c0-a9cf-4d12-b29a-753f57627338
Figure 5: Geological Cross Section C-Dhttps://www.globenewswire.com/NewsRoom/AttachmentNg/9ad20050-05dd-4050-92e2-c22b4467a6d4
Figure 6: Grade Block Model Cross Section C-Dhttps://www.globenewswire.com/NewsRoom/AttachmentNg/3c15be48-63c5-4295-9964-3dfa4b0d5b08
Figure 7: 3-D mineralised model showing the April 2021 and the November 2021 pit shellshttps://www.globenewswire.com/NewsRoom/AttachmentNg/8a2f99c3-c600-4721-ac36-84e3b8d7e5cd
Technical Reports
Additional information with respect to the Company's Imbo Project (which includes the Adumbi deposit) is contained in the technical report of Minecon Resources and Services Limited dated April 27, 2021 and entitled "Updated Resource Statement and Independent National Instrument 43-101 Technical Report, Imbo Project, Ituri Province, Democratic Republic of the Congo". A copy of the said report can be obtained from SEDAR at www.sedar.com and EDGAR at www.sec.gov.
Information with respect to the Company's Makapela Project, and certain other properties of the Company in the Ngayu gold belt, is contained in the technical report of Venmyn Rand (Pty) Ltd dated May 29, 2012 and entitled "Updated National Instrument 43-101 Independent Technical Report on the Ngayu Gold Project, Orientale Province, Democratic Republic of the Congo". A copy of the said report can be obtained from SEDAR at www.sedar.com and EDGAR at www.sec.gov.
About Loncor Gold Inc.
Loncor is a Canadian gold exploration company focussed on the Ngayu Greenstone Gold Belt in the northeast of the Democratic Republic of the Congo (the "DRC"). The Loncor team has over two decades of experience of operating in the DRC. Loncor's growing resource base in the Ngayu Belt currently comprises the Imbo and Makapela Projects. At the Imbo Project, the Adumbi deposit holds an indicated mineral resource of 1.88 million ounces of gold (28.185 million tonnes grading 2.08 g/t gold), and the Adumbi deposit and two neighbouring deposits hold an inferred mineral resource of 2.090 million ounces of gold (22.508 million tonnes grading 2.89 g/t Au), with 84.68% of these resources being attributable to Loncor. Loncor has been carrying out a drilling program at the Adumbi deposit with the objective of outlining additional mineral resources. The Makapela Project (which is 100%-owned by Loncor and is located approximately 50 kilometres from the Imbo Project) has an indicated mineral resource of 614,200 ounces of gold (2.20 million tonnes grading 8.66 g/t Au) and an inferred mineral resource of 549,600 ounces of gold (3.22 million tonnes grading 5.30 g/t Au).
Additional information with respect to Loncor and its projects can be found on Loncor's website at www.loncor.com
Cautionary Note to U.S. Investors
National Instrument 43-101 - Standards of Disclosure for Mineral Projects ("NI 43-101") is a rule of the Canadian Securities Administrators which establishes standards for all public disclosure an issuer makes of scientific and technical information concerning mineral projects. Unless otherwise indicated, all resource estimates contained in this press release has been prepared in accordance with NI 43-101 and the Canadian Institute of Mining, Metallurgy and Petroleum Classification System. These standards differ from the requirements of the U.S. Securities and Exchange Commission, and resource information contained in this press release may not be comparable to similar information disclosed by U.S. companies.
Cautionary Note Concerning Forward-Looking Information
This press release contains forward-looking information. All statements, other than statements of historical fact, that address activities, events or developments that the Company believes, expects or anticipates will or may occur in the future (including, without limitation, statements regarding mineral resource estimates, drill results at the Adumbi deposit, potential underground mineral resources, undertaking the Adumbi Preliminary Economic Assessment to determine the economic viability of Adumbi, potential mineralization, potential gold discoveries, drill targets, exploration results, and future exploration and development) are forward-looking information. This forward-looking information reflects the current expectations or beliefs of the Company based on information currently available to the Company. Forward-looking information is subject to a number of risks and uncertainties that may cause the actual results of the Company to differ materially from those discussed in the forward-looking information, and even if such actual results are realized or substantially realized, there can be no assurance that they will have the expected consequences to, or effects on the Company. Factors that could cause actual results or events to differ materially from current expectations include, among other things, the possibility that future exploration (including drilling) or development (including the Adumbi Preliminary Economic Assessment) results will not be consistent with the Company's expectations, the possibility that drilling programs will be delayed, activities of the Company may be adversely impacted by the continued spread of the widespread outbreak of respiratory illness caused by a novel strain of the coronavirus ("COVID-19"), including the ability of the Company to secure additional financing, risks related to the exploration stage of the Company's properties, uncertainties relating to the availability and costs of financing needed in the future, failure to establish estimated mineral resources (the Company's mineral resource figures are estimates and no assurances can be given that the indicated levels of gold will be produced), changes in world gold markets or equity markets, political developments in the DRC, gold recoveries being less than those indicated by the metallurgical testwork carried out to date (there can be no assurance that gold recoveries in small scale laboratory tests will be duplicated in large tests under on-site conditions or during production), fluctuations in currency exchange rates, inflation, changes to regulations affecting the Company's activities, delays in obtaining or failure to obtain required project approvals, the uncertainties involved in interpreting drilling results and other geological data and the other risks disclosed under the heading "Risk Factors" and elsewhere in the Company's annual report on Form 20-F dated March 31, 2021 filed on SEDAR at www.sedar.com and EDGAR at www.sec.gov. Forward-looking information speaks only as of the date on which it is provided and, except as may be required by applicable securities laws, the Company disclaims any intent or obligation to update any forward-looking information, whether as a result of new information, future events or results or otherwise. Although the Company believes that the assumptions inherent in the forward-looking information are reasonable, forward-looking information is not a guarantee of future performance and accordingly undue reliance should not be put on such information due to the inherent uncertainty therein.
Cautionary Note Concerning Mineral Resource Estimates
The mineral resource figures referred to in this press release are estimates and no assurances can be given that the indicated levels of gold will be produced. Such estimates are expressions of judgment based on knowledge, mining experience, analysis of drilling results and industry practices. Valid estimates made at a given time may significantly change when new information becomes available. While the Company believes that the mineral resource estimates included in this press release are well established, by their nature mineral resource estimates are imprecise and depend, to a certain extent, upon statistical inferences which may ultimately prove unreliable. If such estimates are inaccurate or are reduced in the future, this could have a material adverse impact on the Company.
Mineral resources are not mineral reserves and do not have demonstrated economic viability. There is no certainty that mineral resources can be upgraded to mineral reserves through continued exploration.
Due to the uncertainty that may be attached to inferred mineral resources, it cannot be assumed that all or any part of an inferred mineral resource will be upgraded to an indicated or measured mineral resource as a result of continued exploration. Confidence in the estimate is insufficient to allow meaningful application of the technical and economic parameters to enable an evaluation of economic viability worthy of public disclosure (except in certain limited circumstances). Inferred mineral resources are excluded from estimates forming the basis of a feasibility study.
For further information, please visit our website at www.loncor.com or contact:
John Barker, CEO, +44 7547 159 521
Peter Cowley, President, +44 7904 540 856
圖7:
顯示2021年4月和2021年11月坑殼的三維礦化模型
- 指示礦產資源量為188萬盎司黃金(2818.5萬噸品位2.08克/噸黃金)
- 推斷的礦產資源為178萬盎司黃金(2082.8萬噸品位2.65克/噸黃金),價格為1600美元/盎司
多倫多,2021年11月17日(環球通訊社)--Loncor Gold Inc.朗科爾“或”公司多倫多證券交易所(TSX:“LN”;OTCQX:“LONCF”;FSE:“LO51”)很高興地宣佈增加和升級其位於剛果民主共和國Imbo項目(Loncor 84.68%)的Adumbi礦藏的礦產資源。
與2021年4月概述的推斷礦產資源量315萬盎司黃金(4131.6萬噸品位2.37g/t Au)相比(見公司於2021年4月27日發佈的新聞稿),額外的鑽探信息和使用的金價上漲大大促進了Adumbi礦牀礦產資源的增加,信心增強,達到指示類別的188萬盎司黃金和推斷類別的178萬盎司黃金。其中84.68%的礦產資源歸因於Loncor,其在Imbo項目中擁有84.68%的權益。
下表一概述了Adumbi指示和推斷的基於原地區塊截止品位的礦產資源,氧化物為0.52g/t Au,過渡階段為0.57g/t Au,新鮮材料為0.63g/t Au,並被限制在每盎司1,600美元的優化礦殼範圍內。
表一:阿登比礦牀指示和推斷的礦產資源
(生效日期:2021年11月17日)
礦產資源類別 | 噸位 (公噸)
| 等級 (克/噸Au)
| 含金量 (盎司)
|
指示 | 28,185,000 | 2.08 | 1,883,000 |
推論 | 20,828,000 | 2.65 | 1,777,000 |
注意:由於四捨五入,數字可能不會相加。
下面的表二按材料類型彙總了指示和推斷的類別礦產資源。
表二:按材料類型分列的阿登比礦產資源
(生效日期:2021年11月17日)
| 指示礦產資源 | 推斷的礦產資源 |
| 噸位 | 等級 | 包含 黃金 | 噸位 | 等級 | 包含 黃金
|
材料類型 | (公噸) | (克/噸Au) | (盎司) | (公噸) | (克/噸Au) | (盎司) |
氧化物 | 3,169,000 | 2.05 | 208,000 | 458,000 | 3.39 | 49,000 |
過渡性 | 3,401,000 | 2.51 | 274,000 | 280,000 | 2.74 | 24,000 |
新鮮(硫化物) | 21,614,000 | 2.02 | 1,400,000 | 20,089,000 | 2.64 | 1,703,000 |
共計 | 28,185,000 | 2.08 | 1,883,000 | 20,828,000 | 2.65 | 1,777,000 |
注意:由於四捨五入,數字可能不會相加。
Loncor總裁Peter Cowley在評論今天Adumbi的礦產資源增加和升級時説:“1600美元礦坑殼層內的礦產資源增加到366萬盎司黃金,其中包括188萬盎司黃金的指示礦產資源,這是通過在Adumbi礦牀較淺的部分進行加密鑽探實現的。與2021年4月的上一次資源評估相比,本次資源更新的指示和推斷噸位、品位和盎司是預期的,並與Adumbi的鑽探密度和黃金品位隨深度增加有關(參見2021年4月27日的公司新聞稿-表三)。金礦化在坑殼以下的深處仍然是開放的,那裏是有利的帶狀鐵礦建造的容礦地(“BIF“)正在增厚,並顯示有增加地下礦產資源的潛力。坑殼內的礦產資源將納入初步經濟評估(”豌豆“),公司正在承諾確定Adumbi的經濟可行性,該項目將於今年12月完成。”
該礦產資源評估由本公司的獨立地質顧問Minecon Resources and Services Limited(“礦坑Adumbi的最新估計是基於額外的鑽探和對Adumbi礦牀的審查,包括改建和品位評估,並考慮到CIM對礦產資源具有“合理的經濟開採前景”的要求。
礦產資源更新中包含的鑽探結果
另外鑽了14個巖心孔,共計6,362.59米,重點是在礦坑殼體內鑽探不足的區域,以勾勒出礦產資源的輪廓。露天礦殼體上部的鑽探間距較小,以便將礦產資源從推斷的類別提升到指示的類別。
下表三總結了2021年11月這一礦產資源所包括的額外鑽孔的重大截獲情況:
表三:2021年鑽探計劃的取心孔結果
鑽孔 | 發件人(M) | 至(M) | 截距寬度(米) | 品位(克/噸)金 |
LADD009 | 559.76 | 564.76 | 5.00 | 3.17 |
LADD009 | 581.90 | 614.05 | 32.15 | 6.17 |
LADD009包括 | 599.05 | 600.51 | 1.46 | 94.77 |
LADD009 | 629.56 | 644.92 | 15.36 | 3.73 |
LADD009包括 | 632.00 | 637.89 | 5.89 | 6.56 |
LADD009 | 650.50 | 657.95 | 7.45 | 1.48 |
LADD012 | 784.35 | 797.80 | 13.45 | 3.63 |
LADD012包括 | 784.35 | 786.35 | 2.00 | 9.56 |
LADD012 | 806.30 | 810.35 | 4.05 | 4.73 |
LADD012 | 784.35 | 797.80 | 13.45 | 3.63 |
LADD013 | 394.06 | 401.10 | 7.04 | 2.68 |
LADD013 | 418.65 | 438.65 | 20.00 | 4.21 |
LADD013 包括 | 419.75 | 430.75 | 11.0 | 6.91 |
LADD013 | 452.30 | 469.60 | 17.30 | 2.48 |
LADD013包括 | 457.35 | 465.55 | 8.20 | 4.71 |
LADD014 | 670.00 | 681.80 | 11.80 | 2.97 |
LADD014包括 | 670.00 | 673.53 | 3.53 | 6.44 |
LADD015 | 24.43 | 31.50 | 6.07 | 1.77 |
LADD016 | 672.85 | 680.94 | 8.09 | 1.90 |
LADD016 | 731.51 | 757.10 | 25.59 | 2.39 |
包括 | 737.18 | 743.27 | 6.09 | 4.78 |
包括 | 749.67 | 752.56 | 2.89 | 4.98 |
LADD016 | 672.85 | 680.94 | 8.09 | 1.90 |
LADD017 | 45.55 | 62.70 | 17.15 | 1.90 |
LADD017 | 92.68 | 118.45 | 25.77 | 6.24 |
LADD017包括 | 100.76 | 110.05 | 9.29 | 9.68 |
LADD017包括 | 112.95 | 118.45 | 5.50 | 9.75 |
LADD018 | 93.34 | 113.70 | 20.36 | 0.93 |
LADD018 | 152.48 | 178.20 | 25.72 | 2.26 |
LADD019 | 4.57 | 11.60 | 7.03 | 2.13 |
LADD021 | 75.21 | 88.17 | 12.96 | 2.09 |
LADD021 | 99.74 | 106.00 | 6.26 | 1.09 |
LADD021 | 144.78 | 160.51 | 15.73 | 5.28 |
LADD021包括 | 144.78 | 149.78 | 5.00 | 13.70 |
LADD022 | 20.50 | 42.00 | 21.50 | 2.23 |
LADD022包括 | 25.50 | 34.00 | 8.50 | 4.23 |
LADD023 | 227.10 | 261.73 | 34.63 | 3.12 |
LADD023包括 | 231.65 | 237.40 | 5.75 | 7.23 |
LADD023包括 | 248.10 | 255.25 | 7.15 | 5.55 |
LADD023 | 270.43 | 300.25 | 29.82 | 1.77 |
LADD024 | 216.15 | 227.65 | 11.50 | 3.47 |
LADD024包括 | 224.10 | 227.65 | 3.55 | 7.79 |
LADD024 | 235.97 | 253.75 | 17.78 | 3.20 |
LADD025 | 258.38 | 266.00 | 7.62 | 1.16 |
LADD025 | 279.50 | 286.35 | 6.85 | 3.44 |
LADD025 | 301.10 | 311.57 | 10.47 | 1.74 |
LADD025 | 321.60 | 336.20 | 14.60 | 2.11 |
LADD025 | 342.65 | 361.75 | 19.10 | 4.11 |
LADD025包括 | 349.00 | 357.75 | 8.75 | 5.40 |
注:1、預計LADD009、LADD012、LADD013、LADD014、LADD015、LDD016、LADD017、LADD018、LADD019、LADD021、LADD022、LADD023、LADD024、LADD025的礦化剖面真實寬度分別為82%、86%、85%、78%、65%、69%、71%、75%、65%。
巖心錄井與地質控制
Adumbi的金礦化發現於走向長度為850米、厚度達130米的BIF(帶狀鐵建造)單元內(見下圖1、3、5:Adumbi礦牀的地質平面圖和地質剖面)。BIF內存在四個主要的金礦化帶,它們位於:
- 上BIF序列的上部,
- 上部BIF層序的下部被基本上未礦化的碳質標誌物隔開,以及
- 在較低的BIF序列中。
有一個較高品位的金礦化帶,稱為交代巖帶(“RP區域“)與破壞了主巖BIF組構的蝕變和構造變形有關。RP帶位於上部BIF和下部BIF的下部,沿走向和向下均侵入位於上部和下部BIF帶之間的碳質標誌。
地質建模與品位評價
Adumbi三維模型是由Minecon公司與現場地質學家合作,利用地質成礦剖面圖和水平復理石平面圖構建的,用於輔助三維地質模型的約束。礦化模型被限制在0.5g/t金截止品位的線框內。坡度插值使用以下方法進行:
- 2米長的樣品複合材料上限為18g/t Au,以提高區塊品位估計的可靠性。
- 普通克里格法將坡度內插到塊體模型中。
- 塊體模型中氧化物的相對密度為2.45,過渡巖石的相對密度為2.82,新鮮巖石的相對密度為3.05,用於噸位估算。
凹坑優化參數
為了限制地質模型和任何礦產資源的深度範圍,根據以下礦坑優化參數,為阿登比礦牀建造了一個露天礦坑:
- 金價為每盎司一千六百美元。
- 積木大小:16米x 16米x 8米。
- 最小採礦寬度為32米,最大內部廢物為4米。
- 採礦稀釋度為100%的噸,品位為95%。
- 極限傾斜角為負45度。
- 氧化物的冶金回收率為91%,過渡金屬的回收率為88%,硫化物的冶金回收率為90%(基於作為PEA一部分的診斷冶金測試)。
- 平均開採成本為3.29美元/噸。
- 氧化物的平均加工成本為17.81美元/噸,過渡金屬的平均加工成本為18.92美元/噸,硫化物的平均加工成本為22.13美元/噸。
- 平均雜費和管理費為4.20美元/噸。
- 礦產資源估計為塊狀截止品位,氧化金為0.52g/t,過渡材料為0.57g/t,新鮮材料為0.63g/t,受每盎司1,600美元優化礦場殼的限制(見下圖4、6和7)。
- 黃金運輸和精煉成本相當於金價的4.5%。
- 自2014年RPA研究以來,沒有進行關於手工活動消耗的其他研究,Minecon使用了相同總量的材料。
噸位/坡度曲線
阿登比礦產資源在不同黃金邊際的品位/噸位曲線彙總於表IV和下圖:
表四:不同黃金邊界線上的阿登比礦產資源
塊截斷 | 噸位 | 等級 | 包含的Au |
克/噸自動 | 百萬噸 | 克/噸自動 | 百萬盎司 |
0.0 | 51.60 | 2.23 | 3.70 |
0.5 | 50.10 | 2.29 | 3.68 |
1.0 | 41.15 | 2.61 | 3.45 |
1.5 | 29.07 | 3.17 | 2.97 |
2.0 | 21.76 | 3.66 | 2.56 |
2.5 | 16.06 | 4.17 | 2.15 |
3.0 | 12.12 | 4.63 | 1.80 |
此表所附的等級-噸位曲線可在https://www.globenewswire.com/NewsRoom/AttachmentNg/2221a72e-698f-4295-8242-9c3fdb344163獲得
阿登比礦藏是在隆科的Imbo項目中發現的,該項目還包括另外兩個礦藏:Kitenge和Manzako。由於Adumbi的礦產資源增加,Imbo項目的總推斷礦產資源量目前為209萬盎司黃金(2250.8萬噸品位2.89克/噸Au),詳見下表V。該推斷礦產資源的84.68%歸因於Loncor在Imbo項目中的84.68%權益。
表五:Imbo項目推斷礦產資源量(生效日期:2021年11月17日)
存款 | 噸位 (公噸)
| 等級 (克/噸Au) | 含金量 (盎司) |
阿登比 | 20,828,000 | 2.65 | 1,777,000 |
基騰格 | 910,000 | 6.60 | 191,000 |
曼扎科 | 770,000 | 5.00 | 122,000 |
共計 | 22,508,000 | 2.89 | 2,090,000 |
注意:由於四捨五入,數字可能不會相加。
加上位於Imbo項目西北約50公里處的公司Makapela項目,龍科在阿育地帶的礦產資源總量目前為249.7萬盎司(303.9萬噸品位2.56克/噸Au)和263.9萬盎司推斷礦產資源(2573.1萬噸品位3.19克/噸Au),詳見下表VI:
表六:阿育帶朗科爾地產的指示和推斷礦產資源(生效日期:2021年11月17日)。
礦產資源類別 | 噸位 (公噸)
| 等級 (克/噸Au)
| 含金量 (盎司)
|
指示 | 30,390,000 | 2.56 | 2,497.000 |
推論 | 25,731,000 | 3.19 | 2,639,000 |
注意:由於四捨五入,數字可能不會相加。
質量控制和質量保證
用於分析的鑽芯每隔最長一米取一次,並用金剛石鋸切割,由公司地質學家將其中一半放入密封袋中,然後送到公司的現場樣品製備設施。然後,將芯樣粉碎到80%,通過-2 mm,然後將一半的樣品粉碎到1.5千克,粉碎到90%,通過75微米。大約150克的粉狀樣品隨後被送往坦桑尼亞姆萬紮的SGS實驗室(獨立於本公司)。用火試金法對50g等分進行了金的分析。此外,還採用屏幕火試劑法進行了檢驗,以驗證火試劑法初步獲得的高質量樣品分析結果。作為公司質量保證/質量控制程序的一部分,在提交給SGS實驗室之前,在樣品批次中插入了國際公認的標準、空白和副本。
合格人員
Minecon董事長兼董事總經理Daniel Bansah先生是負責本新聞稿中披露的礦產資源估計和其他技術信息的“合格人士”(該詞在National Instrument 43-101中有定義)。班薩先生已經審核並批准了本新聞稿的內容。
本公告所附數據可在以下網址查閲:
圖1:阿登比礦牀地質平面圖
Https://www.globenewswire.com/NewsRoom/AttachmentNg/71805815-e77c-48ef-9387-3bca872a416a
圖2:帶鑽孔的Adumbi縱向剖面朝東北方向(x級米)Https://www.globenewswire.com/NewsRoom/AttachmentNg/381367ec-0cd0-42f8-a3db-3a9f3f786ac9
圖3:地質剖面A-BHttps://www.globenewswire.com/NewsRoom/AttachmentNg/02c27033-ce38-49ba-af3b-828c12b9425b
圖4:橫斷面A-B的坡面塊模型Https://www.globenewswire.com/NewsRoom/AttachmentNg/3bf8f0c0-a9cf-4d12-b29a-753f57627338
圖5:地質剖面C-DHttps://www.globenewswire.com/NewsRoom/AttachmentNg/9ad20050-05dd-4050-92e2-c22b4467a6d4
圖6:坡面塊模型橫斷面C-DHttps://www.globenewswire.com/NewsRoom/AttachmentNg/3c15be48-63c5-4295-9964-3dfa4b0d5b08
圖7:顯示2021年4月和2021年11月礦坑貝殼的三維礦化模型Https://www.globenewswire.com/NewsRoom/AttachmentNg/8a2f99c3-c600-4721-ac36-84e3b8d7e5cd
技術報告
有關本公司Imbo項目(包括Adumbi礦牀)的其他資料載於Minecon Resources and Services Limited日期為2021年4月27日的技術報告,題為“剛果民主共和國伊圖裏省Imbo項目的最新資源聲明及獨立國家儀器43-101技術報告”。上述報告的副本可從SEDAR網站www.sedar.com和Edgar網站www.sec.gov獲得。
有關本公司Makapela項目及本公司在阿加育金礦帶的若干其他物業的資料,載於Venmyn Rand(Pty)Ltd日期為二零一二年五月二十九日、題為“剛果民主共和國東方省阿加尤金礦項目最新國家儀器43-101獨立技術報告”的技術報告內。上述報告的副本可從SEDAR網站www.sedar.com和Edgar網站www.sec.gov獲得。
朗科黃金公司簡介
朗科是一家加拿大金礦勘探公司,專注於剛果民主共和國東北部的阿加尤綠巖金礦帶(Ngayu Greenstone Gold Belt)。剛果民主共和國“)。朗科團隊在剛果(金)擁有20多年的運營經驗。朗科在阿加育帶不斷擴大的資源基礎目前包括Imbo和Makapela項目。在Imbo項目,Adumbi礦牀擁有188萬盎司黃金(2,818.5萬噸品位2.08克/噸黃金),Adumbi礦牀和兩個鄰近礦牀擁有推斷礦產資源2090萬盎司黃金(2,250.8萬噸品位2.89克/噸Au),其中84.68%的資源可歸因於Loncor。Loncor一直在Adumbi礦藏實施鑽探計劃,目的是勾勒出更多的礦產資源。Makapela項目(由Loncor 100%擁有,距離Imbo項目約50公里)的指示礦產資源量為614,200盎司黃金(22萬噸品位8.66克/噸金),推斷礦產資源量為549,600盎司金(322萬噸品位5.30克/噸金)。
欲瞭解有關朗科公司及其項目的更多信息,請訪問朗科公司的網站:www.loncor.com。
給美國投資者的警示
國家標準43-101-礦產項目披露標準(“NI 43-101“)是加拿大證券管理人的一項規則,它為發行人公開披露與礦產項目有關的所有科技信息建立了標準。除非另有説明,否則本新聞稿中包含的所有資源估計都是根據NI 43-101和加拿大采礦、冶金和石油分類系統編制的。這些標準與美國證券交易委員會的要求不同,本新聞稿中包含的資源信息可能無法與美國公司披露的類似信息相比較。
關於前瞻性信息的注意事項
本新聞稿包含前瞻性信息。除有關歷史事實的陳述外,所有涉及本公司相信、預期或預期未來將會或可能發生的活動、事件或發展的陳述(包括但不限於有關礦產資源估計、Adumbi礦牀的鑽探結果、潛在地下礦產資源、進行Adumbi初步經濟評估以確定Adumbi的經濟可行性、潛在礦化、潛在金礦發現、鑽探目標、勘探結果以及未來勘探和開發的陳述)均為前瞻性信息。這些前瞻性信息反映了基於公司目前掌握的信息對公司的當前期望或信念。前瞻性信息會受到許多風險和不確定因素的影響,這些風險和不確定因素可能會導致公司的實際結果與前瞻性信息中討論的結果大不相同,即使這些實際結果已經實現或實質上實現了,也不能保證它們會對公司產生預期的後果或影響。可能導致實際結果或事件與當前預期大不相同的因素包括,但不限於,未來勘探(包括鑽井)或開發(包括Adumbi初步經濟評估)結果與公司預期不符的可能性,鑽井計劃被推遲的可能性,新型冠狀病毒(“新冠肺炎”)引起的呼吸道疾病大範圍爆發的持續蔓延可能對公司業務造成不利影響,包括公司獲得額外融資的能力,與公司勘探階段相關的風險。, 與未來所需融資的可獲得性和成本有關的不確定性,未能確定估計的礦產資源(公司的礦產資源數字是估計的,不能保證將生產指示的黃金水平),世界黃金市場或股票市場的變化,剛果(金)的政治發展,黃金回收率低於迄今進行的冶金測試所表明的水平(不能保證在現場條件下或在生產過程中,小規模實驗室測試中的黃金回收將在大型測試中重複),貨幣匯率的波動,通貨膨脹本公司在SEDAR(www.sedar.com)和Edgar(www.sec.gov)提交的2021年3月31日Form 20-F年度報告中披露的其他風險、延遲獲得或未能獲得所需的項目批准所涉及的不確定性、解釋鑽井結果和其他地質數據所涉及的不確定性以及在“風險因素”標題下和其他地方披露的其他風險。前瞻性信息僅在提供之日發表,除適用的證券法可能要求外,公司沒有任何更新任何前瞻性信息的意圖或義務,無論是由於新信息、未來事件或結果或其他原因。儘管公司認為前瞻性信息中固有的假設是合理的,但前瞻性信息並不是未來業績的保證,因此,由於這些信息本身的不確定性,不應過分依賴這些信息。
關於礦產資源估算的注意事項
本新聞稿中提到的礦產資源數字是估計值,不能保證一定會生產出指定水平的黃金。這樣的估計是基於知識、採礦經驗、鑽井結果分析和行業實踐的判斷表達。當有新的信息可用時,在給定時間做出的有效估計可能會發生重大變化。雖然本公司相信本新聞稿中包含的礦產資源估計是有充分依據的,但從本質上講,礦產資源估計是不準確的,在一定程度上依賴於最終可能被證明不可靠的統計推斷。如果這樣的估計不準確或在未來減少,這可能會對公司產生重大不利影響。
礦產資源不是礦產儲備,沒有證明的經濟可行性。礦產資源能否通過持續勘探升級為礦產儲備尚不確定。
由於推斷礦產資源可能存在不確定性,不能假設推斷礦產資源的全部或任何部分將因持續勘探而升級為指示或測量礦產資源。對估計的信心不足,不足以有意義地應用技術和經濟參數,以便能夠對值得公開披露的經濟可行性進行評估(某些有限的情況除外)。推斷的礦產資源不包括在構成可行性研究基礎的估計中。
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