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Mongolia
Altan Tsagaan Ovoo (ATO) Mine (ATO Phase 2 Expansion Project)

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 Location:
38 km W from Tsagaan-Ovoo, Mongolia

  Address:
Shangri-La office, Suite 1201, Olympic street 19A, Sukhbaatar District 1
Ulaanbaatar
Mongolia
14241
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  • Overview
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  • Mining
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  • Fleet
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  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
  • Lead
  • Zinc
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life12.5 years (as of Jan 1, 2021)
Progress has been made on the construction and installation of the new fixed crushing unit and it is expected to be operational by September 2022. This is the first major equipment installation for the fresh rock phase, and it will also allow the Company to drive higher crushing rates in the remaining oxide phase with ample excess capacity in the plant. The boiler house for winter leaching and production is complete and operational.
Latest NewsSteppe Gold Announces Fourth Quarter 2022 Operations Update     January 11, 2023


Owners

Source: p. 8
CompanyInterestOwnership
Steppe Gold Ltd. 100 % Indirect
Ownership Tree

Contractors

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Deposit Type

  • Breccia pipe / Stockwork
  • Epithermal


Summary:

The ATO (Altan Tsagaan Ovoo) is an epithermal gold and polymetallic deposit of transitional sulfides in breccia pipes in a Mesozoic continental rift zone.

Three mineralized pipes at ATO (Pipe 1, 2, and 4) have been emplaced into stratified rocks as young as presumably Early to Middle Jurassic. Pipe 4 is mainly concealed. Pipe 3 contains abundant pyrite, but no significant amounts of Au, Ag, Pb, and Zn. There is a strong Au anomaly in soil at TO, as well as other accompanying metals, particularly Pb. In the aeromagnetic field, only post-mineral young dikes have a prominent positive response; much weaker responses outline some ring-shaped features. ATO resides near the center of the latter. Sinter and silicified rocks are reflected as shallow resistivity anomalies, but broad clay and chlorite-altered rocks are characterized by low resistivity. The pipes coincide with chargeability anomalies that overall really are quite weak.

An upper zone of Au-Pb-ZnAg mineralized rock at Pipe 1 is approximately oval in shape and is about 320 m wide. Pipe 2 is elongate to the NE and is approximately 320 m by 160 m in maximum dimension. Pipe 4, which is completely concealed, also is elongate to the NE and is about 400 m by 200 m. The pipes taper slightly with depth and have a carrot-shaped configuration, narrowing gradually to depths of approximately 200 m.

The deepest hole into Pipe 1, inclined 60 degrees, is about 700 m. Silica cap rock has a variable thi ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The ATO mine is an open-pit truck and shovel operation. The truck and shovel method provides reasonable cost benefits and selectivity for this type of deposit. Only open-pit mining methods are considered for mining at ATO.

Pit designs were created to use 5.0 meters benches for mining. Slope parameters were applied as up to 50-degree inter-ramp slope angles; up to 70 degree bench face angles. Ramps were designed to have a maximum centerline gradient of 10%. Design criteria accounts for 3.5 times the width of the truck for running room in areas using twoway traffic. For roads designed outside of the pit, and additional safety berm is accounted for in the road widths. The ultimate pit is separates 3 small mines. Based on a resource block size of 5 m by 5 m by 2.5 blocks, ore loss and dilution was assumed not more than 3% and 2%.

The waste dump is designed as a flat surface extending through the valley to the north. The dump height is not expected to exceed 10 m between the dumping crest to the underlying topography. Waste material is dumped against a berm on the dump face, and dozers are used to maintain the dumping face.

The waste dump has a total capacity of more than 20 million tons of the required 2,846 thousand tons of waste, though there is suitable space to expand the dump to the north or upward.

The final production schedule uses trucks and shovels as required to produce the ore to be fed into the process plant.


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits20212020Avg. Annual (Projected)LOM (Projected)
Gold oz  ......  Subscription required  ......  Subscription required30,516146,669
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré.
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Operational Metrics:

Metrics20212020
Ore tonnes mined  ......  Subscription required  ......  Subscription required
Waste  ......  Subscription required  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required
Annual processing capacity  ......  Subscription required  ......  Subscription required
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Reserves at June 30, 2021:
The open pit mineral reserves are estimated using a cut-off grade of 0.42 g/t AuEq for oxide material and 0.45 g/t AuEq for transition and fresh material.
Mineral Resource Estimate cut-offs: Oxide 0.15 g/t AuEq, Transitional 0.40 g/t AuEq, Fresh 0.40 g/t AuEq.
Bulk densities applied by oxidation level were: Oxide 2.46 t/m³, Transitional 2.59 t/m³, Fresh 2.64 t/m³.

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 26,404 kt Gold 1.14 g/t 968 koz
Proven & Probable 26,404 kt Silver 11.18 g/t 9,491 koz
Proven & Probable 26,404 kt Lead 0.46 %
Proven & Probable 26,404 kt Zinc 0.78 %
Proven & Probable 26,404 kt Gold Equivalent 1.86 g/t 1,579 koz
Measured 23.9 Mt Gold 1.18 g/t 907 koz
Measured 23.9 Mt Silver 15.95 g/t 12,274 koz
Measured 23.9 Mt Lead 0.41 %
Measured 23.9 Mt Zinc 0.66 %
Measured 23.9 Mt Gold Equivalent 1.84 g/t 1,419 koz
Indicated 17.7 Mt Gold 0.85 g/t 483 koz
Indicated 17.7 Mt Silver 14.44 g/t 8,206 koz
Indicated 17.7 Mt Lead 0.34 %
Indicated 17.7 Mt Zinc 0.6 %
Indicated 17.7 Mt Gold Equivalent 1.44 g/t 819 koz
Measured & Indicated 41.6 Mt Gold 1.04 g/t 1,390 koz
Measured & Indicated 41.6 Mt Silver 15.31 g/t 20,479 koz
Measured & Indicated 41.6 Mt Lead 0.38 %
Measured & Indicated 41.6 Mt Zinc 0.63 %
Measured & Indicated 41.6 Mt Gold Equivalent 1.67 g/t 2,238 koz
Inferred 5.6 Mt Gold 0.62 g/t 113 koz
Inferred 5.6 Mt Silver 15.13 g/t 2,732 koz
Inferred 5.6 Mt Lead 0.25 %
Inferred 5.6 Mt Zinc 0.5 %
Inferred 5.6 Mt Gold Equivalent 1.15 g/t 208 koz

Commodity Production Costs:

CommodityUnits2020
Cash costs (sold) Gold USD  ......  Subscription required†
All-in sustaining costs (sold) Gold USD  ......  Subscription required†
† Net of By-Product.
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Operating Costs:

Units2020
OP mining costs ($/t milled) USD  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
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Financials:

Units20212020
Growth Capital M USD  ......  Subscription required  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required
Gross profit M USD  ......  Subscription required  ......  Subscription required
Operating Income M USD  ......  Subscription required
Pre-tax Income M USD  ......  Subscription required
After-tax Income M USD  ......  Subscription required  ......  Subscription required
EBITDA M USD  ......  Subscription required  ......  Subscription required
Operating Cash Flow M USD  ......  Subscription required
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Heavy Mobile Equipment as of March 30, 2021:
HME TypeModelQuantityLeased or
Contractor
Dozer (crawler) ....................... Subscription required ....................... Subscription required Leased
Dozer (crawler) ....................... Subscription required ....................... Subscription required Leased
Excavator ....................... Subscription required ....................... Subscription required Leased
Excavator ....................... Subscription required ....................... Subscription required Leased
Excavator ....................... Subscription required ....................... Subscription required Leased
Excavator ....................... Subscription required ....................... Subscription required Leased
Grader ....................... Subscription required ....................... Subscription required Leased
Truck (dump) ....................... Subscription required ....................... Subscription required Leased
Truck (water) ....................... Subscription required ....................... Subscription required Leased
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 1, 2022
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Technical Report 2017
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News:

NewsDate
Steppe Gold Announces Fourth Quarter 2022 Operations Update January 11, 2023

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