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Canada
Sugar Zone Expansion Project (Sugar Zone)

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 Location:
30 km NE from White River, Ontario, Canada

  Project Contacts:
161 Bay St
Suite 2400
Toronto
Ontario, Canada
M5J2S1
Phone  ...  Subscription required
Fax(416) 853-3690
EmailEmail
WebsiteWeb
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  • Overview
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  • Geology
  • Mining
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  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageFeasibility
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Longhole open stoping
  • Longitudinal retreat
  • Cemented backfill
  • Paste backfill
Mine Life2029


Owners

Source: p. 1
CompanyInterestOwnership
Silver Lake Resources Ltd. 100 % Indirect
On February 21, 2022, Silver Lake Resources Limited completed the acquisition of Harte Gold Corp. and now owns, through Harte Gold, a 100% interest in the Sugar Zone mine and associated 81,287 hectare land package in a prolific gold district in Northern Ontario.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Mesothermal
  • Orogenic
  • Volcanic hosted
  • Porphyry


Summary:

In the Superior Province, major gold deposits are spatially associated with large-scale regional deformation zones and associated Timiskaming-type metasediments (LeClair et al., 1993). These regional structures are interpreted as zones of transpressive terrain accretion.

Typical greenstone-hosted, mesothermal gold deposits are associated with structurally controlled quartz-carbonate veins hosted by moderately to steeply dipping shear zones displaying brittle to ductile deformational features in low-grade (greenschist) metamorphic rocks. In contrast, the Sugar Zone gold deposit is hosted in medium-metamorphic-grade (amphibolite) rocks that exhibit ductile deformation. The Sugar Zone host rocks have been intruded by felsite and porphyry sills, and exhibit strong association of gold with silica-sulphide-potassic alteration.

The Sugar Zone is interpreted as an orogenic, mesothermal gold deposit located in the SDZ, which is an area of high strain. The auriferous zones of the Sugar zone are interpreted to be highly strained altered mafic flows, intermediate to felsic porphyritic intrusions, and boudinaged auriferous quartz veins. Alteration consists primarily of silicification, biotization, and sulphidization. Hydrothermally altered basalt is recognized as a key component of mineralized zones. Commonly in contact with porphyries within mineralized zones, it is strongly silicified biotitic basalt containing significant amounts of pyrrhotite, and pyrite.


Mining Methods

  • Longhole open stoping
  • Longitudinal retreat
  • Cemented backfill
  • Paste backfill


Summary:

The Sugar Zone and Middle Zone mineralization typically comprises tabular, narrow veins, approximately 1.5 m to 3 m thick, and dipping at around 70° to the southwest. Excessive dilution is potentially a major risk to operating success in narrow mineralization. Longitudinal longhole retreat stoping was selected as appropriate for this Deposit based on the favourable geometry, current geotechnical knowledge and success of the Bulk Sample trial mining. Both the ore and the host rock are sufficiently competent to facilitate the void sizes required for effective longhole stoping.

The longhole open stoping mining method provides the following advantages:
- Safe – personnel do not enter the production mining voids (remote-controlled equipment only).
- Proven – many instances of the methods application throughout the world.
- Highly mechanized – reduces personnel exposure to health and safety risks.
- Easy access to resources – skilled labour and equipment are readily accessible locally and around the world.
- Low cost – leverages off large drill and blast scale and minimization of development.

Empirical stope stability analyses by RockEng concluded that, for typical conditions, stopes are expected to perform well:
- Stress in the major influence on stability variability:
-- Above 200 m mining depth stress conditions are favourable (A factor is 0.8–1.0).
-- Between 200 and 500 m mining depth is a transition zone.
-- ........


Crushing and Grinding
Source: Subscription required

- subscription is required.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold koz 99752
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Daily ore mining rate  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Plant annual capacity  ......  Subscription required
Daily processing capacity  ......  Subscription required
Daily processing rate  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual ore mining rate  ......  Subscription required
Mining scale, tpd  ......  Subscription required
Processing scale, tpd  ......  Subscription required
* According to 2021 study.
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Reserves at December 31, 2020:
Cut-off grade is 5 g/t Au for reported Mineral Reserves.
Cut-off grade is 3 g/t Au for reported Mineral Resources.

CategoryTonnage CommodityGradeContained Metal
Probable 3.454 Mt Gold 7.18 g/t 797 koz
Indicated 2.803 Mt Gold 11.87 g/t 1,070 koz
Inferred 1.866 Mt Gold 9.45 g/t 567 koz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Gold USD  ......  Subscription required&nbs
All-in sustaining costs (AISC) Gold USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2021 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2021
UG mining costs ($/t milled) CAD 122 *
Processing costs ($/t milled) CAD  ......  Subscription required
G&A ($/t milled) CAD  ......  Subscription required
Total operating costs ($/t milled) CAD  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

2021 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Expansion CapEx $M CAD  ......  Subscription required
Sustaining CapEx $M CAD  ......  Subscription required
Closure costs $M CAD  ......  Subscription required
Total CapEx $M CAD  ......  Subscription required
UG OpEx $M CAD  ......  Subscription required
Processing OpEx $M CAD 122
Backfill costs $M CAD  ......  Subscription required
Transportation (haulage) costs $M CAD 35.7
G&A costs $M CAD 162.5
Total OpEx $M CAD  ......  Subscription required
Mining Taxes $M CAD  ......  Subscription required
Income Taxes $M CAD  ......  Subscription required
Net revenue (LOM) $M CAD  ......  Subscription required
EBITDA (LOM) $M CAD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M CAD  ......  Subscription required
After-tax Cash Flow (LOM) $M CAD  ......  Subscription required
Pre-tax NPV @ 5% $M CAD  ......  Subscription required
After-tax NPV @ 5% $M CAD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
Subscription required - Subscription is required.


Heavy Mobile Equipment as of January 1, 2021:
HME TypeSizeQuantityStatus
ANFO Loader ....................... Subscription required Existing
Backhoe ....................... Subscription required Existing
Bolter ....................... Subscription required Existing
Drill jumbo (single boom) ....................... Subscription required Existing
Drill jumbo (two boom) ....................... Subscription required Existing
Grader ....................... Subscription required Existing
Loader ....................... Subscription required Existing
Loader (FEL) ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
Load-Haul-Dump (LHD) 4.5 cu. m ....................... Subscription required Existing
Load-Haul-Dump (LHD) 1.8 cu. m ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required Proposed
Scissor Lift ....................... Subscription required Existing
Tractor trailer ....................... Subscription required Existing
Truck (boom) ....................... Subscription required Existing
Truck (fuel / lube) ....................... Subscription required Existing
Truck (haul) 30 t ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 5, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 5, 2021
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2019
................................... Subscription required 2019
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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