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China
Gaocheng (GC) Mine

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 Location:
48 km E from Yunfu, China

  Address:
Suite 601 – Building 1 China View Mansion #A2 East GongTi Road Chaoyang District
Beijing
China
100027
Phone  ...  Subscription required
Fax8610-8587-1132
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Silver
  • Lead
  • Zinc
Mining Method
  • Resue mining
  • Shrinkage stoping
  • Cemented backfill
Production Start...
Mine Life2034
Latest NewsSilvercorp Reports Adjusted Net Income Of $37.0 Million, $0.21 Per Share, And Cash Flow From Operation Of $85.6 Million For Fiscal 2023     May 25, 2023


Owners

Source: p. 8
CompanyInterestOwnership
Silvercorp Metals Inc. 99 % Indirect
Yangtze Mining Ltd. (“Yangtze Mining”) was incorporated on February 11, 2002, under the laws of the BVI. It holds a 100% interest in Yangtze Mining (H.K.) Ltd. (“Yangtze Mining HK”). Yangtze Mining HK holds a 95% interest in Guangdong Found Mining Co. Ltd. (“Guangdong Found”), a company incorporated on October 26, 2008 under the laws of the People’s Republic of China, that holds a 100% interest in the silver, lead and zinc exploration permits on the project in Gaocheng (the “GC Mine” or “Gaocheng”) in Guangdong Province. In October 2018, Silvercorp Metals (China) Inc., a wholly-owned subsidiary of the Company, acquired an additional 4% interest in Guangdong Found, and as a result, the Company now beneficially owns a 99% interest in Guangdong Found.

Contractors

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Deposit Type

  • Mesothermal
  • Vein / narrow vein


Summary:

The poly-metallic mineralization of the GC deposit belongs to the mesothermal vein infill style of deposit and exhibits the following characteristics:

• The mineralization occurs as veins which are structurally controlled within broader alteration zones. The alteration can reach more than a few metres along the faults distributing in both hangingwall and footwall.
• The veins have a sharp contact with the host rocks and steeply dip at angles between 60 – 85°.

In general, the Ag-Zn-Pb mineralization occurs along the strike of the faults. The veins have true widths varying from just over 0.1 m to over 10 m. They have been traced for over 1,250 m along strike, and approximately 550 m down dip.

Ag-Zn-Pb mineralization at the GC deposit can be divided into two types: primary and oxidized. The primary mineralization is mainly composed of galena-sphalerite-silver minerals which occur sparsely, as disseminations, veinlets and lumps. Primary mineralization accounts for 95% of the entire Mineral Resource. Oxide mineralization occurs on and near the surface.

Mineralized veins in the GC area occur in relatively permeable fault-breccia zones. These zones are extensively oxidized from the surface to depths of about 40 m. Veins in this zone exhibit open space and boxwork lattice textures resulting from the leaching and oxidation of sulphide minerals. Secondary minerals present in varying amounts in this zone include kaolinite, hematite, and l ........


Mining Methods

  • Resue mining
  • Shrinkage stoping
  • Cemented backfill


Summary:

Mining has been conducted in two stages that are horizontally defined by mine sections and vertically by elevations, with a general description as follows:
1 Stage 1: +150 mRL to -50 mRL between local Mine Sections 10 to 36 for development and 12 to 32 for production - west side of project.
2 Stage 2: +100 mRL to -50 mRL between Mine Sections 36 to 54 for development and 32 to 54 for production. From -50 m RL to -300 mRL between Mine Sections 12 to 50 for both development and production.

Stage 1 essentially targeted bringing the project into production as soon as practicable using mobile rubber-tired diesel-powered equipment (development jumbo, loader, and truck) with surface declines access down to -50 mRL.

Stage 2 development from -50 mRL down to -300 mRL employs conventional tracked equipment (battery powered locomotives, rail cars, electric rocker shovels and pneumatic handheld drills) via a surface shaft access.

Selective stoping methods - shrinkage and resuing - are employed with stope production drilling conducted with pneumatic jackleg drilling. In-stope rock movement is by gravity to draw points or hand-carting to steel-lined passes.

Stage 1 production mucking used load-haul-dump loaders (LHD) with trucks hauling ore to the surface ROM stockpile, and ore was re-handled from the ROM stockpile to the primary crusher feed bin using a ROM front-end-loader (FEL).

Stage 2 and ongoing product ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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^ Guidance / Forecast.

Production:

CommodityUnits2023202220212020201920182017
Silver koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required570600
Lead M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required288,995 t244,338 t260,696 t
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required284,218 t245,783 t260,746 t
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
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Reserves at December 31, 2020:
Mineral Resource are reported at a silver equivalent (AgEq) cut-off grade of 105 g/t AgEg.

Mineral Reserve:
• Full breakeven cut-off grades: Shrinkage = 215 g/t AgEq: Resuing = 275 g/t AgEq.
• Marginal material cut-off grade: Shrinkage = 185 g/t AgEq; Resuing = 250 g/t AgEq.

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 4.131 Mt Silver 94 g/t 12,483 koz
Proven & Probable 4.131 Mt Lead 1.5 % 135 M lbs
Proven & Probable 4.131 Mt Zinc 3.2 % 293 M lbs
Measured & Indicated 10.033 Mt Silver 82 g/t 26,363 koz
Measured & Indicated 10.033 Mt Lead 1.2 % 265 M lbs
Measured & Indicated 10.033 Mt Zinc 2.8 % 619 M lbs
Inferred 8.441 Mt Silver 87 g/t 23,562 koz
Inferred 8.441 Mt Lead 1 % 195 M lbs
Inferred 8.441 Mt Zinc 2.4 % 442 M lbs

Commodity Production Costs:

CommodityUnits202220212020201920182017
Credits (by-product) Silver USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -35.59 / oz   -26.18 / oz  
Total cash costs (sold) Silver USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† -12.37 / oz†   -6.47 / oz†  
All-in sustaining costs (sold) Silver USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† -3.69 / oz†   0.2 / oz†  
All-in costs Silver USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† -2.88 / oz†   0.8 / oz†  
† Net of By-Product.
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Operating Costs:

Units202220212020201920182017
UG mining costs ($/t mined) USD 50.647.746.44645.740
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1.9   1.1  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 27.9   20.7  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required



Heavy Mobile Equipment as of March 31, 2021:
HME TypeModelSizeQuantityLeased or
Contractor
Drill jumbo (single boom) ....................... Subscription required ....................... Subscription required Leased
Loader 0.3 cu. m ....................... Subscription required Leased
Load-Haul-Dump (LHD) 1 cu. m ....................... Subscription required Leased
Load-Haul-Dump (LHD) 3 cu. m ....................... Subscription required Leased
Personnel Carrier ....................... Subscription required Leased
Shotcreter ....................... Subscription required Leased
Truck (haul) 13 t ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 11, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2022
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Annual Information Form 2022
Corporate Presentation 2022
Management Discussion & Analysis 2022
Sustainability Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Management Discussion & Analysis 2018
Management Discussion & Analysis 2017
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News:

NewsDate
Silvercorp Reports Adjusted Net Income Of $37.0 Million, $0.21 Per Share, And Cash Flow From Operation Of $85.6 Million For Fiscal 2023 May 25, 2023
Silvercorp Reports Operational Results And The Financial Results Release Date For Fiscal 2023 April 13, 2023

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