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Canada
Sugar Zone Mine (Sugar Zone Expansion Project)

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

  Address:
161 Bay St, Suite 2400
Toronto
Ontario, Canada
M5J2S1
Phone  ...  Subscription required
Fax(416) 853-3690
EmailEmail
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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
  • Gold
Mining Method
  • Longhole open stoping
  • Longitudinal retreat
  • Cemented backfill
  • Paste backfill
Processing
  • Dewatering
  • Dry Screening
  • Shaker table
  • Smelting
  • Filter press plant
  • Gravity separation
  • Flotation
  • Magnetic separation
Mine Life14 years (as of Jan 1, 2019)
On March 30, 2020, the Company temporarily suspended operations at the Sugar Zone Mine to preserve the health and safety of the Company’s workforce and the surrounding communities during the COVID-19 pandemic.

On July 17, 2020, the Company began its phased restart of mining operations at the Sugar Zone Mine, completing the restart on August 5, 2020 when the mill began processing ore.
Latest NewsHarte Gold Announces Completion of Sales Process to Silver Lake Resources     February 18, 2022


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 Hart Gold, a 100% interest in the Sugar Zone mine and associated 81,287 hectare land package in a prolific gold district in Northern Ontario.

Deposit Type

  • Vein / narrow vein
  • Mesothermal
  • Orogenic


Summary:

The Sugar Zone Deposit is interpreted as an orogenic, mesothermal gold deposit located in a zone of high strain within the Dayohessarah Greenstone Belt. The Deposit is hosted in mediummetamorphic grade (amphibolite) rocks that exhibit ductile deformation and have been intruded by felsite and porphyry sills. The gold is associated with silica-sulphide-potassic alteration.

In the Sugar Zone Gold Deposit, gold mineralization occurs in quartz veins, quartz stringers and quartz flooded zones predominantly associated with narrow porphyry sills, porphyry contact zones, hydrothermally altered mafic metavolcanics and, rarely in weakly altered mafic metavolcanics. The mineralization occurs in three parallel zones, the Upper, Lower and Footwall Subzones, that range in thickness from 1.5 to 10 m, strike at 140° and dip between -65° and -75° to the west. The three subzones are separated by 20 to 30 m of non-mineralized metavolcanics. The Sugar Deformation Zone is a high strain deformation zone associated with the mineralization with a northwest trend and dips west at 65o to 75o . The mineralization has been defined for over 1.5 km strike length and to a vertical depth of over 1,200 m and remains open along strike and at depth. Fine to coarse-grained specks and blebs of visible gold are common in the Sugar Zone quartz veins, usually occurring within marginal, laminated or refractured portions of the veins. Quartz veins and silicified rocks also contain varying amounts of pyrrhotite, pyrite, chalcopyrite, galena, sphalerite, molybdenite and arsenopyrite.

Other mineralized zones have been observed between, above and below the Sugar Zone Upper and Footwall Subzones, in diamond drilling. Most of these intercepts are believed to be quartz veining originating in either the Upper or Footwall Subzone, that have been diverted from the sheared part of the zone, up to 15 m from the main bodies of mineralization. One of these zones is the Lynx Zone, which lies east of the southern end of the Sugar Zone.

The Middle Zone, located between the Sugar and Wolf Zones, may represent the extension of the Sugar Zone to the north. The zone occurs within a highly strained package of massive and pillowed flows exhibiting various degrees of biotite alteration. Gabbro sills and flows are common about the zone. Similar to the Sugar Zone, a weak Upper and Footwall Zone may locally be developed. The zone typically ranges from 1.5 to 10.0 m in thickness.

Middle Zone gold mineralization is often associated with quartz veins and veinlets hosted within a package of altered mafic volcanic and feldspar porphyry. The gold mineralization is often accompanied by 1-5% pyrrhotite and pyrite with local sections of minor galena and sphalerite. Galena is normally indicative of higher grades and the presence of visible gold.

The auriferous Wolf Zone lies along strike of the Sugar Zone, and may represent the northern extension of the SDZ. It is defined as highly strained packages consisting of variously altered mafic volcanic flows and gabbros. The zone ranges in true thickness from 0.5 to 8.0 m.

The Wolf Zone is made up of highly sheared mafic metavolcanics, and a network of intrusive, intermediate quartz-feldspar porphyry dykes/sills. Alteration in the mafic volcanic and gabbro units consists mainly of silicification (both pervasive and quartz veining), diopside alteration and magnesium rich, brown biotite alteration. Alteration within the intermediate porphyry units consist of mostly silicification, with small amounts of magnesium-rich brown biotite, and no diopside. The zone is observed in trenches to pinch and swell over 30 m.

Wolf Zone gold mineralization mostly occurs in quartz veins, stringers and quartz flooded zones predominantly associated with porphyry zones, and hydrothermally altered basalts and gabbros. Fine-grained specks of visible gold are occasionally observed in the Wolf Zone quartz veins. The visible gold itself is often observed to be concentrated within thin fractures, indicating some degree of remobilization. Quartz veins and floods also contain varying amounts of pyrrhotite, pyrite and occasional galena. The presence of galena is a strong indicator of the presence of visible gold. Pyrite and pyrrhotite form most of the total sulphides, but do not appear to be
directly related to the presence of gold mineralization.


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.

Paste backfill is the primary fill type and has the following advantages:
- Reduces the need for rock pillars, maximizing ore recovery.
- Reduces the duration of the stoping cycle.
- Reduces the number of diesel powered loading and hauling units underground thereby reducing the overall primary ventilation.
- Reduces the size of the surface tailings storage facility.

The paste backfill plant was designed to generate paste backfill at a rate of 320 m3 of backfill per day. The schedule calls for an average paste backfill rate of 210 m3 of total backfill per day, implying a 65% utilization factor of the paste backfill plant. An agitator truck (typical concrete delivery truck) will transport the paste backfill from the paste backfill plant to various paste backfill holes located along strike directly above the orebody. All critical paste backfill lines will be duplicated or “twinned” to permit filling activities to continue in the event of line blockage. Underground reticulation lines will direct the paste backfill from the bottom of the surface delivery hole along the levels and into the stopes and will comprise drilled holes, steel pipe and HDPE pipe. Paste backfill barricades will be constructed in the lower sill drives using predominantly waste rock that is sealed with dry-mix shotcrete. Each barricade will be removed prior to blasting the next stope.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher ....................... Subscription required 1
Cone crusher ....................... Subscription required 1
Ball mill 3m x 5.8m 800 kW 1

Summary:

Primary and Secondary Crushing
The crushing area consists of three modules, a Jaw Unit, a Screener Unit and a Cone/Secondary Crusher Unit. The ROM material from underground is fed directly to the Primary Jaw Crusher (through a grizzly) and ROM bin. This material is then screened through a vibrating screen with a 13 mm aperture, the undersize reports to the fine feed stockpile and the oversize to the secondary crusher.

The Jaw unit includes a 15-minute capacity ROM Bin, Vibrating Grizzly Feeder and C80 Jaw Crusher to reduce the material from a 400 mm topsize to a 45 mm P80. The jaw crusher is fed by a vibrating grizzly feeder (“VGF”) set to scalp at 5 cm (2 inches). VGF oversize reports to the jaw, and undersize -5 cm (-2 inches) bypasses directly to the screen feed conveyor. Crusher circuit simulations show 50% of the feed passing to the crusher with a 5 cm (2 inches) grizzly spacing. The screen feed conveyor is equipped with a metal detector which will automatically stop the belt. Tramp metal is manually removed from the belt.

The Cone/Secondary Crusher Unit consists of an intermediate surge bin, vibrating feeder and HP100 cone crusher. The material from the cone crusher is returned to the jaw crusher discharge belt to return to the classification screen.

Grinding
The process plant feed conveyor is fitted with a weightometer to monitor and control the feed rate to the ball mill. The weightometer is also used to proportionally add water to the grinding circuit based on feed tonnage.

The grinding area is made up of a 3 m diameter x 5.8 m long (10 ft diameter x 19 ft long), 800 kW ball mill in closed circuit with a cyclone pack. The mill is designed to produce a P80 75 microns grind size.

Ore is fed to the ball mill at a controlled rate, nominally 36.5 dry tph, and water is added to the feed chute to achieve the desired milling density. Product from the ball mill discharges through a trommel with the oversize reporting to the scats bunker where it is periodically removed by a skidsteer loader and returned to the circuit via the clean-up hopper.

Trommel undersize gravitates to the guard screen feed hopper where it is further diluted to achieve the required cyclone feed density before entering the pair of gravity concentrators. The gravity concentrators operate in a staggered manner so that their backwashing and flushing cycles are staggered.

Once the material has passed through the gravity concentrators the cyclone feed pump delivers slurry to the cyclone cluster which has a duty and standby arrangement. Cyclone underflow gravitates to the ball mill, while cyclone overflow gravitates to the sulphide flotation circuit.

Two vertical spindle sump pumps, one located at the feed end of the ball mill and another at the discharge end of the mill service the area. The concrete floor under the ball mill area is sloped to the sumps to facilitate cleanup. Grinding media for the ball mill is introduced by use of a dedicated kibble and the grinding building gantry crane.


Processing

  • Dewatering
  • Dry Screening
  • Shaker table
  • Smelting
  • Filter press plant
  • Gravity separation
  • Flotation
  • Magnetic separation

Flow Sheet: Subscription required

Summary:

The existing process plant currently produces both a gold doré bar and a bagged gold concentrate through gravity concentration and flotation circuits, respectively. The process plant was originally commissioned at 575 tpd and is awaiting a permit to increase the production rate incrementally to its nameplate 800 tpd. The increase in production will be achieved by running the crushing plant longer every day and increasing the speed of various mechanical equipment items within the process plant.

The major process steps in the existing process plant are as follows:
- Primary and Secondary Crushing
- Fine Feed Storage (Stockpile)
- Grinding (Ball Mill)
- Gravity Concentration
- Flotation
- Concentrate Thickening and Filtration
- Tailings Thickening
- Reagents Makeup
- Process Water, Clean Water, Fire Water
- Paste Backfill.

Gravity Recovery
The gravity circuit takes the ball mill discharge and sends it to a guard ........

Recoveries & Grades:

CommodityParameter202120202019
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.

Production:
2020 figures based on 259 operating days, including mine operating days in Q3 2020.

CommodityUnits202120202019
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in conc./ doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019
Daily milling rate  ......  Subscription required
Daily ore mining rate  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required201,214 t
Daily processing rate  ......  Subscription required  ......  Subscription required559 t
Ore tonnes mined  ......  Subscription required  ......  Subscription required174,539 t
Daily processing capacity  ......  Subscription required  ......  Subscription required800 t
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at December 31, 2020:
Mineral Reserves are reported at a cut-off grade of 5.0 g/t Au.
Mineral Resources are reported at a cut-off grade of 3.0 g/t Au.

CategoryTonnage CommodityGradeContained Metal
Probable 3,454 kt Gold 7.18 g/t 797 koz
Indicated 2,803 kt Gold 11.87 g/t 1,070 koz
Inferred 1,866 kt Gold 9.45 g/t 567 koz

Commodity Production Costs:

CommodityUnits202120202019
Cash costs Gold USD  ......  Subscription required ^  ......  Subscription required  ......  Subscription required
All-in sustaining costs (AISC) Gold USD  ......  Subscription required ^  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operating Costs:

Units2020
Total operating costs ($/t milled) CAD 269

Financials:

Units20202019
Capital expenditures M CAD  ......  Subscription required
Revenue M CAD  ......  Subscription required  ......  Subscription required
Operating Income M CAD  ......  Subscription required  ......  Subscription required
Pre-tax Income M CAD  ......  Subscription required  ......  Subscription required
After-tax Income M CAD  ......  Subscription required  ......  Subscription required
EBITDA M CAD  ......  Subscription required  ......  Subscription required
Operating Cash Flow M CAD  ......  Subscription required
Subscription required - Subscription is required


Proposed Heavy Mobile Equipment as of February 14, 2019:
HME TypeSizeQuantityLeased or
Contractor
Bolter ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2021
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
Press Release 2022
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Press Release 2018
Preliminary Economic Assessment 2012
Subscription required - Subscription is required.

News:

NewsDate
Harte Gold Announces Completion of Sales Process to Silver Lake Resources February 18, 2022
Harte Gold Announces Court Approval of Successful Bidder in Sale and Investment Solicitation Process January 28, 2022
Harte Gold Announces Successful Bidder in Sale and Investment Solicitation Process January 20, 2022
Harte Gold Announces Auction in Sale and Investment Solicitation Process January 17, 2022
Harte Gold Announces Extension of Stay Period, Approval of Increased DIP Financing and Approval of Sale and Investment Solicitation Process December 20, 2021
Harte Gold Announces Positive Feasibility Study Results for Expansion to 1,200 tpd January 20, 2021
Harte Gold Announces Positive Feasibility Study For The Sugar Zone Mine April 8, 2019
Harte Gold Announces 2018 Drilling Increases Indicated Mineral Resources by 55% February 20, 2019
Harte Gold Strengthens Management Team For Operations January 17, 2019
Harte Gold Declares Commercial Production At Sugar Zone Mine January 8, 2019
Harte Gold Announces First Gold Pour and Provides Project Update October 16, 2018
Harte Gold Announces Successful Sugar Zone Mine Plant Commissioning And Start Up October 3, 2018
Harte Gold Receives Permits for Commercial Production September 20, 2018
Harte Gold Provides Construction and Permitting Update August 8, 2018
Harte Gold Announces Positive PEA For the Sugar Zone Project May 4, 2018
Harte Gold Provides Corporate Update April 3, 2018
Harte Gold Triples Mineral Resource At The Sugar Zone Project February 15, 2018

Subscription required - Subscription is required.

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