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Dominican Republic
Candelones Project

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 Location:
103 Km W from Santiago De Los Caballeros, Dominican Republic

  Project Contacts:
Ste. 2704-401 Bay St. P.O. Box 4
Toronto
Ontario, Canada
M5H 2Y4
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Overview

StagePermitting
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
  • Copper
Mining Method
  • Truck & Shovel / Loader
Processing
  • Smelting
  • Carbon re-activation kiln
  • Filter press plant
  • Dewatering
  • Heap leach
  • Carbon in column (CIC)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life3 years (as of Jan 1, 2021)
Latest NewsUnigold Candelones project remains on-track for Q3 delivery of feasibility, ESIA and Exploitation Licence     April 27, 2022


Owners

Source: p. 21
CompanyInterestOwnership
Unigold Inc. 100 % Indirect
Unigold holds a 100% interest in the Neita Concession by means of Mining Resolution R-MEM-CM-016-2018, granted by the Ministry of Energy and Mines (Ministerio de Energiá y Minas) on May 10, 2018, through the Directorate General of Mining (Direccion General de Minera or DGM).

Deposit Type

  • Epithermal
  • Vein / narrow vein
  • Breccia pipe / Stockwork
  • VMS
  • Hybrid


Summary:

The term Candelones Project refers to the area within the Concession in which the Candelones Main (CM), Candelones Extension (CE) and Candelones Connector (CMC) deposits are located. The deposits that comprise the Candelones Project are entirely contained within the confines of the property.

The Candelones deposits feature anomalous gold, silver, copper, lead and zinc mineralization. To date, all mineralization is confined to brecciated dacite volcanoclastics where they are in contact with andesite volcanics/volcanoclastices (CMC, CE) or dacite volcanics (CM).

Mineralization is currently interpreted to be a product of a hybrid type system. Volcanogenic massive sulphide (VMS) in a shallow water, back arc basin setting, is interpreted to have introduced low tenor copper, lead and zinc mineralization, coeval with deposition of the host dacite volcanoclastics, over a widespread area. Post mineral uplift developed extensive folding and faulting, interpreted to have produced extensive brecciation within the dacite volcanoclastic unit. The brecciated dacites offered ideal pathways for later, epithermal mineralization events associated with the late calc-akaline intrusives mapped elsewhere in the Tireo Formation that are possibly largely buried within the Concession limits. Hydrothemal fluid flow related to these buried intrusives is interpreted to have introduced the majority of the gold and silver into the Candelones deposits. The final stage of mineralization was reactivation of the fault systems followed by a late, mafic volcanic event which emplaced the observed mafic dikes and/or sills. These late intrusives are proximal to the high-grade systems that have been the focal point of drilling since 2015. It is currently interpreted that these late mafic intrusives may have remobilized gold to the dike margins.

At the CE and CMC deposits, mineralization is stratigraphically restricted to dacite volcanoclastics that underlie a sequence of andesite volcanics and volcanoclastic rocks. The contact strikes east-west and the dip varies from horizontal at the CMC and western limit of the CE, to 70º south at the eastern limit of the CE. The variability in dip is currently interpreted to be the result of the extensive faulting produced during the formation of the island of Hispaniola.

Dacite Breccia Mineralization – VMS Type
Dacite breccia typically starts at the andesite-dacite contact and extends for up to 125 m. Brecciation decreases as the distance from the contact increases, as does the tenor of mineralization. The contact can be identified visually. It is the most distinctive marker horizon identified to date. The footwall of the dacite breccia can be identified visually in the core as the intensity of brecciation decreases but the actual terminus of the mineralization is defined by assay cut-off. There is a sharp, order of magnitude decrease in gold grade from 100 ppb to 10 ppb that defines the footwall terminus of the host dacite.

Massive Sulphide Mineralization
Drilling in late 2015 intersected a zone of massive sulphide mineralization that is interpreted to be discordant to the andesite-dacite contact, striking northeast and plunging to the east at approximately 30º. The massive sulphide is pyrite dominant and has returned gold and copper values that are elevated by an order of magnitude relative to the VMS mineralization. The massive sulphide mineralization has been traced by drilling for a strike length of 350 m along an east-northeast trend. Gold and copper grades within the massive sulphide mineralization are markedly consistent, with no significant outliers.

Quartz Vein Polymetallic Mineralization – Target B Candelones Extension
Drilling in 2016 confirmed the presence of high-grade gold, silver, copper and zinc associated with quartz +/- barite veining and matrix replacement at Target B of the Candelones Extension. Pyrite and sphalerite are also common, with rare chalcopyrite and galena. This high-grade target is 150 m west of the massive sulphide mineralization at Target A and is interpreted to be a product of one or more hydrothermal fluid floods into the host dacite breccia, along interpreted sub-vertical, NE and NW fault zones. Drilling has intersected higher grade gold values over 150 m strike length. The mineralization is interpreted to occur as anastomosing veins within a fault bounded, sub-vertical fault block.

Dacite Breccia – Target C Mineralization
Target C mineralization is very similar to Target B. Elevated gold values are associated with a zone of intense brecciation. Sub-angular to sub-rounded fragments of dacite tuff are set in a silica-sulphide matrix dominated by sphalerite and pyrite, with rare chalcopyrite and galena. Gold occurs preferentially in areas that are flooded by barite and quartz or proximal to what are interpreted to be sub-vertical mafic dikes that bisect the breccia unit.

Candelones Connector
Mineralization at the CMC deposit occurs within a brecciated dacite tuff stratigraphically above an andesite volcanoclastic unit. Elevated gold values are associated with a zone of intense brecciation. Sub-angular to sub-rounded fragments of dacite tuff are set in a silica- sulphide matrix dominated by pyrite. Gold occurs preferentially in areas that are flooded by barite and quartz. As at the CE deposit, the gold mineralization is interpreted to be spatially related to NE and NW trending faults that are interpreted from the current data set. Unlike the CE deposit, mineralization at the CMC outcrops to surface and is intensely weathered and oxidized to a depth approaching 30.0 m from surface. Metallurgical testing to date suggests that gold recoveries are particularly robust, with +95% recovery estimated from direct cyanidation. Below the oxide horizon, the mineralization appears to be largely VMS type mineralization, limited to the brecciated dacites, to the andesite contact where anomalous grades are immediately truncated. Below the oxide horizon, the mineralization appears to be largely VMS type mineralization, limited to the brecciated dacites, to the andesite contact where anomalous grades are immediately truncated.

Candelones Main
Mineralization at the CM deposit occurs within a broad interval of brecciated dacite tuff in contact with what is interpreted to be a dacite intrusive. The CM deposit strikes northwest, almost perpendicular to the strike of the CE deposit, and dips at 50-70º to the northeast. The mineralization is interpreted to be largely VMS type mineralization, with the tenor of mineralization directly related to the intensity of brecciation. The hanging wall rocks are comprised of dacite tuffs. As at the CMC deposit, the CM mineralization outcrops to surface and is oxidized to depths of over 30 m. Strong clay alteration is also common, with extensive illite and montmorillonite associated with the mineralized envelope near surface. Extensive silica alteration is also observed within the sulphide component below the oxidation cap.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Due to the fact that the targeted mineralization is located at or near the surface topography, it was determined that mining of the deposit would be best performed by open pit rather than underground methods.

The Candelones Starter Pit will primarily be mined using hydraulic excavators, which are easily able to free dig the mineralized overburden and oxidized rock and waste down to the transition material. The PEA assumes that only the transition leach feed and transition waste will require blasting. The total amount of rock that will require blasting is 14% of the total and will be encountered during the latter half of the mine life.

The leach feed to be sent to a primary crusher will be oxidized saprolitic material which will not be blasted, transition material which is partially oxidized and is planned to be blasted 75% of the time, and fresh unoxidized sulphide rock which will be blasted 100% of the time and will use a higher powder factor.

The production requirement for the Candelones Project was to establish a mining rate that would achieve an optimal balance between capital cost minimization and operating cost minimization. This was achieved through the adoption of a three-year mine life, with all mineralized rock above the cut-off grade going directly to the primary crusher and then onto the leach pad.

Mining of the Candelones Starter pit will generally be executed in 4 m benches, using 2 m flitches where preferred. Whereas the block model has 6 m x 6 m x 2 m (height) dimensions, the mine planning has the ability to look at strategic selectivity using of 2 m flitches, as needed. However, for improved productivity, 4 m benches will be preferred where possible. Where drilling is required in the transition material, 4 m will be drilled with 0.75 m subgrade.

The overall pit slope angles are all below the 40° maximum. The pit covers an area of 15.7 ha, has a perimeter of 3.3 km in length, measures 0.88 km from east to west and 0.60 km from north to south. The elevation along the pit’s perimeter varies from 516 m to 607 m.

The mining rate follows the 5,000 t/d throughput capacity of the crushing circuit by which the leach feed is reduced in size prior to being loaded onto the leach pad. This amounts to 1.8 Mt of leach feed planned to be mined, crushed and leached per year.

The updated sulphide mineral resource estimate disclosed herein assumes that the mineral deposits at the Candelones Project will be exploited primarily by means of an open pit, followed by the transition to an underground mine with associated processing facilities and infrastructure. Unigold believes there are multiple benefits offered by combining the open pit and underground mining methods for the sulphide deposits.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Sizer 1

Summary:

ROM material will be hauled from the mine and dumped onto a coarse leach feed stockpile. The coarse material will be fed into a hopper equipped with a 500 mm opening static grizzly and crushed in a mineral sizer to less than 150 mm. The crusher design nominal throughput is 417 t/h based on operating seven days per week, 16 hours per day and a 75% equipment availability.

The crushed mineralization will be conveyed to a stockpile where loaders will transfer it into a hopper and a belt feeder will discharge it into haul trucks for transport to the heap leach pad. Prior to discharge of the leach feed into the trucks, it will be dosed with hydrated lime at a rate of 4.0 kg Ca(OH) 2 /t.


Processing

  • Smelting
  • Carbon re-activation kiln
  • Filter press plant
  • Dewatering
  • Heap leach
  • Carbon in column (CIC)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The process selected for the Candelones Oxide PEA comprises a 5,000 t/d heap leach operation.

A total of 5,000 t/d of mineralization from the Candelones open pit will be mined and hauled approximately 3 km onto a “run-of-mine” heap leach pad. The feed to the leaching process will then be crushed using a mineral sizer, in order to break-up agglomerates and oversized material. The leach feed will be mixed with hydrated lime prior to being delivered to the heap leach pad. The pad will be irrigated with a leach solution obtaining, an average 75% leach gold recovery following a 10-week leach cycle.

Gold and silver will be recovered from the pregnant leach solution (PLS) by contacting the solution with granular activated carbon-in-columns (CIC), followed by a Zadra adsorption, desorption and regeneration (ADR) plant, comprising acid wash, elution, carbon handling, carbon regeneration, electrowinning cells and refinery to produce doré bars. No tailings facility will be r ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, % 75
Gold Head Grade, g/t 0.75

Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Gold Payable metal oz 90,116
Gold Metal in doré oz 31,04095,587

Operational Metrics:

Metrics
Stripping / waste ratio  ......  Subscription required
Daily ore mining rate  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Daily processing capacity  ......  Subscription required
Annual processing capacity  ......  Subscription required
Annual ore mining rate  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

Reserves at May 10, 2021:
Cut-off grades of 0.28 g/t Au (OXIDE PIT), 0.49 g/t Au (TRANSITION), 0.66 g/t Au (SULPHIDE – OPEN PIT) and 1.90 g/t Au (SULPHIDE – UNDERGROUND).

CategoryOreTypeTonnage CommodityGradeContained Metal
Measured & Indicated Sulphide 20,484 kt Gold 1.62 g/t 1,065 koz
Measured & Indicated Oxide 3,467 kt Gold 0.82 g/t 91 koz
Measured & Indicated Sulphide 20,484 kt Silver 3.79 g/t 2,497 koz
Measured & Indicated Sulphide 20,484 kt Copper 0.15 % 65,731 k lbs
Measured & Indicated Sulphide 20,484 kt Gold Equivalent 1.89 g/t 1,244 koz
Inferred Sulphide 23,797 kt Gold 1.39 g/t 1,063 koz
Inferred Oxide 1,632 kt Gold 0.68 g/t 36 koz
Inferred Sulphide 23,797 kt Silver 2.58 g/t 1,972 koz
Inferred Sulphide 23,797 kt Copper 0.09 % 45,878 k lbs
Inferred Sulphide 23,797 kt Gold Equivalent 1.55 g/t 1,190 koz

Commodity Production Costs:

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

Operating Costs:

Units2021
OP mining costs ($/t milled) USD 3.22 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

2021 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 31.5
G&A costs $M USD 10.2
Total OpEx $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
Operating margin (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax NPV @ 10% $M USD  ......  Subscription required
Pre-tax NPV @ 7.5% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
After-tax NPV @ 7.5% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of May 10, 2021:
HME TypeModelQuantityLeased or
Contractor
Dozer (crawler) ....................... Subscription required ....................... Subscription required Leased
....................... 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 required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Dec 2, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required May 10, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required May 10, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required May 10, 2021
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2021

Corporate Filings & Presentations:

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

News:

NewsDate
Unigold Candelones project remains on-track for Q3 delivery of feasibility, ESIA and Exploitation Licence April 27, 2022
Unigold Appoints Mr. Gordon Babcock as Chief Operating Officer December 2, 2021
Unigold Announces Non-Brokered Private Placement of up to $2,340,000 September 17, 2021
Unigold intersects 16.0 metres averaging 10.78 g/t Au in a new zone to the west of the Candelones resource August 17, 2021
Unigold Announces Closing of Private Placement of 25,192,350 Units for Gross Proceeds of Approximately $3.275 Million August 10, 2021
Unigold Files NI43-101 Technical Report on Candelones Project June 7, 2021
Unigold Updates Mineral Resource Estimate for the Candelones Project May 13, 2021
Unigold Inc. Delivers Positive PEA for Candelones Oxide Project April 26, 2021

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