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Ethiopia
Da Tambuk Project (Mato Bula Project)

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 Location:
32km NW from Shire, Ethiopia

  Project Contacts:
777 Dunsmuir Street, 17th Floor
Vancouver
British Columbia, Canada
V7Y 1K4
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
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  • Filings & News

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Overview

StagePermitting
Mine TypeUnderground
Commodities
  • Gold
  • Silver
  • Copper
Mining Method
  • Cut & Fill
  • Sub-level stoping
  • Cemented backfill
Mine Life4 years (as of Jan 1, 2018)
The Adyabo Project includes the Mato Bula and Da Tambuk deposits.

EAM’s partners in the development of the Mato Bula and Da Tambuk mines, Tibet Huayu Mining, have confirmed EMPC studies are complete and preparations to initiate mine development at Mato Bula and Da Tambuk remain in place.


Owners

Source: p. 3
CompanyInterestOwnership
East Africa Metals Inc. 30 % Indirect
Tibet Huayu Mining Co., Ltd. 70 % Indirect
Tibet Huayu Mining Co. Limited (“THM”) is be responsible for 100% financing of both Adyabo’s Mato Bula and Da Tambuk mine construction costs resulting in a 70% THM and 30% East Africa Metals Inc. ownership.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Orogenic
  • VMS


Summary:

The geology near the Da Tambuk deposit comprises a northeast trending assemblage, from west to east, that includes a thick sequence of black and grey shales (locally with rare graphitic beds), mafic tuff and bedded chert, chlorite sericite schist and variable chlorite sericite schist. Locally, the assemblage is intruded by feldspar phyric quartz eye porphyry, and leuco grabbroic units. In the area of mineralization, strong silicification is noted locally, along with quartz veining.

A zone of phyllic alteration (sil-ser-py) has been mapped over 700 m of north-south trending strike between the Mato Bula north and Da Tambuk south. This zone of alteration may prove to be the linking structure between the Mato Bula north and Da Tambuk prospect, and if true, presents 700 m of prospective strike.

This trend passes 200 m to the east of Mato Bula North, which is a gold-rich volcanichosted massive sulphide (VHMS)-type target found on the southern licence boundary of the Adi Dairo concession. The alteration indicates that Da Tambuk prospect appears to be on a separate trend with Mato Bula and Silica Hill. This hypothesis is supported by the different geochemical nature of Mato Bula North (high copper, low gold) verses Mato Bula, Silica Hill and Da Tambuk (high gold, low copper). In addition, Mato Bula and Silica Hill are hosted within altered schist, whereas Mato Bula North is hosted higher up in the sequence in the VTSM unit. However, this theory cannot be confir ........


Mining Methods

  • Cut & Fill
  • Sub-level stoping
  • Cemented backfill


Summary:

The Da Tambuk operation has been planned as an underground mining operation to produce 550 t/day of mill feed.

A combination of cut-and-fill mining and sublevel stoping was considered for the underground operations. Cut-and-fill will be used to mine areas with irregular mining shapes that would be unsuitable for sublevel stoping, which is a bulk mining method.

Cut-and-fill requires placing waste rock or tailings into mined out excavations for use of both as ground support and as a working platform for subsequent mining cuts.

Sublevel stoping does not necessarily require backfill. The method involves blasting large voids underground that become non-entry stopes. The method requires using remote control mucking equipment, which is standard practice in modern underground mining.

CUT-AND-FILL MINING
The proposed cut-and-fill mining involves the following steps:

1. An attack ramp is driven off the main access ramp at a grade of -15% into the mineralization.

2. The first cut is excavated by driving along the vein to the width of the vein. This may be done in stages to allow partial backfilling of mined-out areas.

3. If the mineralization is narrow, blast holes will be drilled upwards into the next cut and “slashing” the rock down into the first cut. If the mineralization is wide or if rock stability is not adequate for large spans, then the first cut will be backfilled immediately after mining. ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold koz 2495
Silver koz  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Daily ore mining rate 482 t *
Waste tonnes, LOM 101.65 kt *
Ore tonnes mined, LOM 650.42 kt *
Daily processing capacity 550 t *
Tonnes processed, LOM 650 kt *
Annual processing capacity 200 kt *
* According to 2018 study.

Reserves at May 30, 2018:
The resources reported for Da Tambuk cut-off grade of 2.2 g/t Au.

CategoryTonnage CommodityGradeContained Metal
Indicated 775,000 t Gold 4.51 g/t 112,000 oz
Indicated 775,000 t Silver 2.4 g/t 59,000 oz
Indicated 775,000 t Copper 0.11 % 1.9 M lbs
Indicated 775,000 t Gold Equivalent 4.65 g/t 116,000 oz
Inferred 110,000 t Gold 4.04 g/t 14,000 oz
Inferred 110,000 t Silver 2.93 g/t 10,000 oz
Inferred 110,000 t Copper 0.06 % 0.2 M lbs
Inferred 110,000 t Gold Equivalent 4.13 g/t 15,000 oz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Gold USD 420 / oz *†  
All-in sustaining costs (AISC) Gold USD 642 / oz *†  
Assumed price Silver USD 17 / oz *  
Assumed price Gold USD 1,325 / oz *  
* According to 2018 study / presentation.
† Net of By-Product.

Operating Costs:

Units2018
UG mining costs ($/t milled) USD 31 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2018 study.
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2018 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 14.2
G&A costs $M USD 5.9
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
Net Operating Income (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 @ 8% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
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Proposed Heavy Mobile Equipment as of April 30, 2018:
HME TypeSizeQuantity
Drill jumbo (two boom) ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 11, 2018
....................... Subscription required ....................... Subscription required Subscription required Nov 23, 2022
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Corporate Filings & Presentations:

DocumentYear
Quarterly Report 2022
Preliminary Economic Assessment 2018
Press Release 2018
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