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Tanzania
Buckreef Mine

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 Location:
170km NW from Shinyanga, Tanzania

  Address:
8P.O. Box 10953
Mwanza
Tanzania
Phone  ...  Subscription required
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  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Shaker table
  • Smelting
  • Carbon re-activation kiln
  • Spiral concentrator / separator
  • Dewatering
  • Hydrochloric acid (reagent)
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life16 years (as of Jan 1, 2020)
During October 2021, Buckreef Gold completed construction of the 360 tpd processing plant expansion. Buckreef Gold also continued to operate the 120 tpd processing plant subsequent to concluding the test period, which achieved a 90% gold recovery rate, as previously disclosed in September 2021. The existing 120 tpd processing plant has been integrated into the new processing plant circuit.
February 17, 2022 - The first phase of the oxide mill expansion of 360 tonnes per day (tpd) at the Buckreef Gold Project (Buckreef Gold) is now fully commissioned, and production has successfully ramped up to design capacity. Project is on track to step up ore production rates to 1,000+ tpd in Q2/Q3 2022.
The 1,000+ tpd operation is expected to be capable of producing 15,000 - 20,000 ounces of gold per year based on the initial mine plan and grade profile.
Latest NewsTanzanian Gold Corp.: Buckreef Gold Completes First Phase of Mill Expansion and Achieves Record Gold Production     February 17, 2022


Owners

Source: p. 20
CompanyInterestOwnership
State Mining Company (STAMICO) 45 % Indirect
Tanzanian Gold Corp. 55 % Indirect
On December 16, 2010, the Company signed a binding Heads of Agreement with Stamico setting forth the key terms to develop the Buckreef Project for which the Company paid Stamico US $3,000,000. On October 25, 2011, Tanzam, a wholly owned subsidiary of the Company, entered into a Definitive Joint Venture Agreement for Re-Development of the Buckreef Gold Mine with Stamico. Under the Joint Venture Agreement, Tanzam holds a 55% interest and Stamico holds the remaining 45% interest in the joint venture company called Buckreef Gold Company Limited (“BGC Ltd.”). Through Tanzam, the Company has 100% control over all aspects of the joint venture.

Deposit Type

  • Orogenic
  • Vein / narrow vein
  • Porphyry


Summary:

Buckreef Gold Project (“Buckreef”) comprises of four gold deposits namely Buckreef, Eastern Porphyry,Tembo and Bwinga all within 4km of each other. Buckreef deposit is the largest of the four deposits of the area.

Buckreef Deposit
The Buckreef Prospect is a shear zone hosted gold deposit within a sequence of mafic basalts and dolerites, near basement granite. The host rocks at the Buckreef deposit comprise primarily pillowed, amygdaloidal and massive mafic meta-volcanic rocks which have been intruded by medium to coarse grained dolerite sills and dykes. Slivers of carbonaceous units have been observed in some drill-core sections incorporated in the metavolcanic assemblages. Minor granitoids (possibly metasomatic) are noted in the north part of the deposit towards the contact with the northern granite.

The mineral assemblage includes py, ± po, cpy, mt with associated silica, carbonate and sericite alteration. Gold is associated directly with sulphides as microscopic inclusions. Sulphides are disseminated and may comprise up to 5% of the rock by volume. The gold mineralization at Buckreef Prospect is non-refractory in both fresh and oxide material. Deep drill-holes indicate that high grade mineralized zones plunge steeply to the north. Several narrow, more discontinuous sub-parallel zones of similar alteration and mineralization have been defined both to the west and to the east of the main fault zone. Detailed logging of drill-hole core reveals a prominent deepening of the oxidation profile above portions of both the Main and North Zones. Superimposed on the host rock is an intensely weathered laterite profile up to 40m depth. Gold may be concentrated in the oxide weathering profile by supergene processes. Fresh sulphides generally do not occur shallower than 40m from surface. The base of the oxidation zone occurs between 15m and 40m, with an average depth of 30m, and the overburden consists of both black cotton soils and lateralized duricrusts with an average depth of ±3m-4m, to a maximum of 20m.

Bingwa Deposit
The Bingwa Prospect is located adjacent to a sheared contact with a granitic intrusive and is approximately 4km east of the Buckreef deposit Gold mineralization has been identified in a drilling program over a strike length of 350m and up to 100m below surface, with the main zone of mineralization occurring over a strike length of 150m. Gold mineralization at Bingwa is associated with quartz veining in strongly foliated and altered greenstone in a shear zone adjacent to the granitoid contact. The shear zone strikes northeast and dips steeply to the northwest. The main zone of mineralization is associated with the junction of a northwest striking, shallowly north dipping fault and the northeast striking shear zone.

Deformation, alteration and gold mineralization appear to be limited to rheological contacts, between basalt and the early quartz veins and along the margin of the granite. The difficulty in constructing continuous grade envelopes may be due to limited continuity of the early quartz vein array, and/or the possibility that the veins are folded, transposed and boudinaged within shear zones. Most the mineralization defined to date occurs within the oxide zone, which extends to 40m-60m below surface. The entire deposit is overlain by 5m to 8m of overburden and transported alluvial. Much of the Bingwa Prospect gold mineralization in the weathered profile occurs in lower saprolite, below the redox boundary. There is negligible upper saprolite below the overburden cover. Given that there is typically limited chemical dispersion of gold in lower mafic saprolite, this may be one of the reasons for poor lateral grade continuity at the Bingwa Prospect. However, recent work at the Bingwa Prospect indicates that mineralization is hosted within the north-northwest to south-southeast trending structures at the intersection with the major northeast-southwest shear zone. The intersection between these structures is considered to play an important role in controlling high grade zones.

Eastern Porphyry Deposit
The Eastern Porphyry deposit is located 0.8km east of the Buckreef main deposit and consists of weakly to moderately sheared felsic porphyry and younger fresh feldspar quartz porphyry dykes up to 30m wide within a mafic sequence dominated by medium grained dolerite. The Eastern Porphyry structures occur within sheared basaltic lavas and medium grained dolerite intrusive of the northeast-southwest trending Nyamazama River lineament. The elongated intrusion attains a maximum thickness of 280m, but thins and disperses to the northeast and southwest into a series of relatively narrow quartz-feldspar-porphyry dykes.

The Eastern Porphyry mineralization is associated with silicified and weakly pyritised shears, quartz veins and veinlets, and within quartz-feldspar porphyry. Quartz veining within the felsic unit may contain pyrite with or without low grade mineralization. However, zones of shearing within the dolerite up to 7m in width are associated with silica-carbonate-pyrite alteration. The mineralization has a total strike length of approximately 1,500m. The main intrusion is coincident with a circular magnetic anomaly in the area with a diameter of 350m (Barrett, 2000). In places the quartz-feldspar porphyry is magnetite bearing, readily deflecting a hand magnet.

The gold mineralization occurs in a similar lithological and structural setting as at Buckreef Prospect, but the intensive carbonate-silica-pyrite alteration typical of the Buckreef deposit is lacking or poorly developed. The fact that mineralization on the Nyamazama River lineament is less well developed than at Buckreef may be due to less dilation of the northeast-southwest shear compared to that of Buckreef Prospect or the presence of the porphyry intrusion which inhibited fluid flow and was less chemically reactive than the basalt.

Tembo Deposit
The Tembo deposit locates approximately 3km southwest of Buckreef Mine, adjacent to the main Rwamagaza Shear Zone. The mineralized zones at Tembo are confined to the east – west trending shears within met-basaltic volcanic package. Alteration in the mineralized zones consists of silica carbonate-pyrite with well-preserved shear fabric.

Gold mineralization is associated with grey quartz thin veins, stringers and boudins parallel to the shear fabric. At Tembo deposit, the transported and residual soil cover is 7m to 9m deep, below which, completely altered and sheared mafic material occurs to a depth of 50m. Most of the oxidised zone has been exploited by artisanal mining.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The project consists of four deposits that are Buckreef, Eastern Porphyry, Tembo and Bingwa. These are near to the surface and are suitable for open pit mining method. The deposits consist of weathered zones/soft, transition and fresh zones. At Buckreef project all the deposits are near surface, consequently Open Pit mining method was chosen.

During the year the Company hired a Tanzanian mining contractor (FEMA) on a two-year contract to mine ore, waste and a tailings storage facility at Buckreef. During October and November 2021, the Company, through FEMA, successfully and safely completed two blasts in high grade areas where transitional ore reached near surface enabling access to high grade ore blocks.

First bucket at the oxide open pit was on April 6, 2020.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher
Ball mill 2
Vertical mill / Tower

Summary:

Crushing and milling
The material is conveyed to the jaw crushers. The discharge from the crushers is collected in a crusher bin, from where it is conveyed to the milling plant. Tramp iron is removed from the conveyor using an electromagnet. The close-side setting of the crusher is 40 mm in order to create a feed of the optimal size to the EDS mill.

The crushed ore is combined with the oversize material from the mill on the feed conveyor to the mill. The feed from the conveyor is split in a two-way splitter chute, which discharge directly into the EDS multi-shaft mills. Each of the mills discharges directly into the feed chute of a Rotaspiral. The Rotaspirals are fitted with a sizing screen of 100 µm (90 x 400 µm). The oversize from the Rotaspiral is discharged onto a conveyor that feeds it back onto the mill feed conveyor as a recirculating load. Thus, the mill product will be 100% passing 100 microns. The undersize forms the product from the milling sections and is pumped at a specific gravity of about 1.4 to the gravity concentrators.

For the treatment of the oxide ore, about 50% of ore will report to the undersize in the scrubber and will not be fed to the crushing and milling section. Consequently, the production through the mill will only be 50% of capacity. The design of the mill anticipates that 20% of the material fed to the mill will be oversize on a single pass. Thus, the re-circulating load to the mill will be 120%.

EDS multishift mill is of a vertical mill consisting of several horizontal shafts at various levels. The shafts drive internal fingers or flingers that accelerate the particles. The particles break due to impact with the rotating flingers, with the wall, or with the mill liners attached to the body.

Highlights for the month of February 2022:
Buckreef Gold continues to advance construction of a 1,000+ tpd oxide processing plant while simultaneously successfully operating the 360 tpd operation.

Two new 360 tpd ball mills (to the same specifications and from the same manufacturer as the existing operational mill) arrived at site.

The targeted completion date of the 1,000+ tpd processing plant is calendar Q2/Q3 2022 and the expanded processing plant is expected to produce 15,000 – 20,000 oz of gold per year based on the initial mine plan and grade profile.


Processing

  • Gravity separation
  • Shaker table
  • Smelting
  • Carbon re-activation kiln
  • Spiral concentrator / separator
  • Dewatering
  • Hydrochloric acid (reagent)
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

During October 2021, the Company completed construction of a 360 tpd processing plant expansion. Buckreef Gold also continued to operate the 120 tpd processing plant subsequent to concluding the test period, which achieved a 90% gold recovery rate. The existing 120 tpd processing plant has been integrated into the new processing plant circuit as a ‘regrind mill’. The new processing plant construction was completed in line with the scheduled completion date of late September/October 2021. The run-of-mine mill feed commenced on November 6th, 2021 and continues to ramp up throughput. The 360 tpd throughput is expected to increase production to 750-800 ounces of gold per month once steady state processing has been achieved.

Buckreef Gold will continue with plans and construction to advance a 1,000+ tpd operation while simultaneously operating the 360 tpd operation. It was determined that the most cost effective and timely approach to building a 1,000+ tpd processing plant was t ........

Recoveries & Grades:

CommodityParameter2021
Gold Recovery Rate, %  ......  Subscription required
Gold Head Grade, g/t  ......  Subscription required

Production:

CommodityUnits2021Avg. Annual (Projected)LOM (Projected)
Gold oz  ......  Subscription required51,000822,000
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics2021
Total tonnes mined  ......  Subscription required
Ore tonnes mined  ......  Subscription required
Waste  ......  Subscription required
Tonnes milled  ......  Subscription required
Daily milling rate  ......  Subscription required
Daily mining rate  ......  Subscription required
Subscription required - Subscription is required.

Reserves at May 15, 2020:
Mineral Resources: Main Zone at 0.4g/t cut-off, and Eastern Porphyry, Bingwa and Tembo at 0.5 g/t cut-off.

The Mineral Resources and Reserves as at August 31, 2021 at Buckreef are unchanged from May 15, 2020.

CategoryTonnage CommodityGradeContained Metal
Proven 9,471,909 t Gold 1.72 g/t 524,518 oz
Probable 9,730,764 t Gold 1.36 g/t 426,492 oz
Proven & Probable 19,202,673 t Gold 1.54 g/t 951,010 oz
Measured 20.99 Mt Gold 2.03 g/t 1,367,202 oz
Indicated 17.59 Mt Gold 1.46 g/t 827,308 oz
Measured & Indicated 38.57 Mt Gold 1.77 g/t 2,194,510 oz
Inferred 19.55 Mt Gold 1.14 g/t 717,922 oz

Operating Costs:

Units2021
OP mining costs ($/t mined) USD 2.22
Processing costs ($/t milled) USD  ......  Subscription required
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of May 15, 2020:
HME TypeModelSizeQuantity
Backhoe 4.5 cu. m
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Dec 6, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 6, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 6, 2021
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Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Pre-Feasibility Study Report 2018
Feasibility Study Report 2017
Subscription required - Subscription is required.

News:

NewsDate
Tanzanian Gold Corp.: Buckreef Gold Completes First Phase of Mill Expansion and Achieves Record Gold Production February 17, 2022
TanGold Announces Closing Of $7.0 Million Registered Direct Offering January 26, 2022
TanGold Announces $7.0 Million Registered Direct Offering January 24, 2022
TanGold Continues Execution on Sustainable Business Plan January 14, 2022
Tanzanian Gold Corporation: Significant Exploration Potential and Rapidly Growing Production November 30, 2021
TanGold Announces 1,000+ TPD Processing Plant Expansion Plan for Buckreef Gold October 28, 2021
Buckreef Gold Commences Commissioning of Expanded Processing Plant October 20, 2021
TanGold Introduces New Discovery - Buckreef West Gold Zone Near Surface - Open at Depth & to the South May 3, 2021
Gold Production Started At Buckreef Oxide Project June 17, 2020
Tanzanian Gold Announces Doubling Of Resources In Measured + Indicated Categories And Highlights Upside In Exploration Targets on its Buckreef Gold Project March 17, 2020
Tanzanian Gold announces an upper level intercept of 48m (incl. 5m @6.6g/t and 1.0M @ 16.8 g/t ) and a deeper intercept of 13.4m (incl. 8.0m @ 4.9 g/t) in the first hole of the Phase III deep drilling program testing the underground potential at Buck February 26, 2020
Tanzanian Gold announces 4,291,000 ounces of gold contained in unclassified resources at the conclusion of its Phases 1 & 2 Resource Upgrade drilling along the 1.2km Buckreef Shear Zone February 14, 2020
Tanzanian Gold Announces End of Phase II Drilling and Start of Phase III Ultra-Deep Drilling; 50m @ 1.8 g/t Au Including 5m @ 4.6 g/t Au, 7m @3.9 g/t Au and 1.0m @ 7.0 g/t Au Confirms Northeast Extension Still Open January 23, 2020
Tanzanian Gold Confirms that Buckreef Zone Still Open to N.E. October 11, 2019
Tanzanian Gold Announces Drill Results Below Buckreef Open Pit Bottom Intercepts of 38.7m @ 5.2g/t Au including 4m @ 18.1g/t September 26, 2019
Tanzanian Gold Announces Further Results From Drilling Below Pit Bottom Highlights Include 63m @ 4.8 g/t Au incl 22m @ 9.3 g/t Au that incl 2m @ 31.1 g/t Au June 6, 2019
Tanzanian Gold Announces End of Phase I In-Pit Drilling Program May 30, 2019
Tanzanian Gold Announces Drill Results From Below the Open Pit at Buckreef including 1.0m @ 50.54g/t Gold and 1.2m @ 12.82g/t Gold in 21.3 meters of robust mineralization May 1, 2019
Tanzanian Royalty Announces New Results From Upgrade Drilling at Buckreef. Intercepts of 16m @ 6.72g/t Gold including 3m @ 25.17g/t March 25, 2019
Tanzanian Royalty Announces Results From First Hole of Upgrade Drilling at Buckreef Intersects 8m @ 2.32g/t gold and 11m @3.06g/t Au February 27, 2019

Aerial view:

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