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Ethiopia
Mato Bula Project

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 Location:
33 km NE from Indaselassie, Ethiopia

  Project Contacts:
700 - 1055 W.Georgia Street
PO Box 11108
Vancouver
British Columbia, Canada
V6E 3P3
Phone  ...  Subscription required
Fax+1-604-899-1240
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  • Mining
  • Processing
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  • Filings & News

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Overview

StagePermitting
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
  • Copper
  • Gold Equivalent
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Flotation
Mine Life8 years (as of Jan 1, 2018)
Latest NewsEast Africa Receives Final Payment in Adyabo Transaction     December 2, 2019


Owners

Source: p. 45
CompanyInterestOwnership
East Africa Metals Inc. 100 % Indirect
In 2011 TRI acquired an undivided 80% interest of the Adyabo Property, in February 2016 EAM obtained the remaining 20% interest. EAM, through TRI, owns 100% of the Adyabo Property and has full ownership of the Mato Bula Project, located within the Adyabo Property.

Deposit Type

  • VMS
  • Orogenic


Summary:

The Mato Bula gold-rich VMS deposit is the main deposit discovered to date within the Adyabo Project, and covers the Mato Bula North, Silica Hill North, Silica Hill, Mato Bula, Jasper Hill and Halima Hill mineralized zones.

Two mineralized structures are present at Mato Bula Hill; the Main lode and the Upper lode.

The Main lode at Mato Bula is located south of the crest of the Mato Bula Hill, and is a narrow high-grade gold shoot extending over a strike length of 120 m at surface. Numerous active artisanal gold bedrock workings are present at Mato Bula exploiting this gold lode, and an upper lode, reportedly to a depth of 46 m.

The shoot has steep dip, vertical plunge, and maximum true width of 3 m. At depth the maximum strike of the shoot is reduced to 80 m, but the structure remains open at depths greater 220 m below surface.

Silica-pyrite alteration is extensive laterally (750 m strike) and in thickness (159 m wide), and zones of silica-pyrite are present in the hanging wall and along strike, in a zone up to 150 m wide and 750 m long.

Mineralization is hosted within a shear zone that contains abundant quartz veining, silicification, sericitization and carbonate alteration. Gold is associated with chalcopyrite-rich veins in intense silica alteration, and also the presence of possibly V-rich mica (roscoelite). The Main lode averages 5.5 g/t gold and 0.61% copper, and has a high gold:silver ratio of 10.2. Lead and zinc concentrations are negligible.

The Jasper Hill zone (sometimes known as Mato Bula South) contains structurally controlled gold lodes (vein/wall rock porphyry hosted), and extend from the Mato Bula zone in the north towards Halima Hill in the south. The upper and main lodes within this zone exhibit more complex geometry due to possible faulting (or slumping) and wall rock interaction. Mineralization is lithologically controlled with the gold-bearing zones within a jasperoid alteration zone. Gold concentration decreases, with increasing zinc concentration, moving away from the jasperoid unit. Gold-bearing veins have also been identified perpendicular to the long core axis.

The Main lode at Jasper Hill is located 40 m southeast of the Upper lode, southwestwards along strike from the Mato Bula zone, and outcrops along strike for 80 m. The structure has a maximum true thickness of 9 m, and an average gold grade of 4.53 g/t and copper grade of 0.85%. It has the highest gold:silver ratio in the Mato Bula prospect of 5.3:1, and a low gold:copper (x10) ratio of 0.56:1. The average silver concentration is low, 0.85 g/t, and only trace amounts of lead and zinc are present. The lode plunges at approximately 60 to 70° to the southwest, and remains open down plunge below depths of 200 m from surface.

The most southerly manifestation of the Mato Bula Trend is the mineralized zone at Halima Hill, 320 m to the southwest of the Jasper Hill zone. Halima Hill was targeted due to the presence of artisanal trenching, with lower order gold-copper geochemistry present within an alteration zone. Apart from a zone of subcrop at Halima Hill, much of the southern part of the trend is covered in thick (50 cm to 2 m) transported colluvium, thus reducing the geochemical signature at Halima Hill relative to the hilltop workings of Mato Bula North, Silica Hill and Mato Bula.

Mineralization was present as pyrite- chalcopyrite bearing quartzveins within altered tuffs. The assay results and visual interpretation of alteration at Halima Hill indicate the Mato Bula system is weakening to the south near surface, however the IP survey is suggestive of additional increasing potential at depth.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Open pit mining is planned as conventional truck and shovel open pit mining with drill and blast.

The PEA open pit contains the following:
• 3.3 Mt of potential mill feed
• 30 Mt of waste rock (including mineralized material below cut-off grade)
• 322,000 tr oz of gold
• 75,000 tr oz of silver
• average NSR US$111/t processed.

The pit consists of three distinct sections, namely a northern satellite pit with high grades, a central pit from which much of the mill feed will be sourced and a southern limb which mines shallow mineralisation with lower grade.

The pit slope design is based on a maximum overall slope of 49°. The bench heights for mining are designed at 5 m high, with triple benching between catch benches of 5 m wide. Haul roads are designed around the width of 25 t articulated dump trucks and are planned as 15 m wide.

Mining will be managed by qualified engineering professionals such that the operations are conducted safely and efficiently. The management of operations will include mine planning, surveying of open pits, assaying of rock to be mined for minerals, and geotechnical engineering for pit walls and WRSF stability.

Mining will be done by first drilling and blasting the rock so that it can be loaded by loader onto haul trucks. Waste rock will be transported by haul trucks to designated WRSF, while rock containing mineralization will be transported to the crusher for subsequent processing.

Drilling and blasting has been considered for the PEA. It is assumed to consist of drilling of 5 to 10 m bench heights with 89 and 115 mm holes. Tetra Tech has made provisions for track mounted drill rigs for drilling blast holes.

The holes would be charged primarily with ammonium nitrate and fuel oil (ANFO) where possible and cartridged emulsion explosive if holes are wet. Initiation is assumed to be carried out using nonel systems with pentolite boosters. Explosives will be stored onsite, with blasting carried out at the end of shifts to ensure minimal disruption to other pit activities.

For this PEA, loading was assumed to be done by excavator with support from a wheeled loader. The minimum mining width has been included in the design as 15 m based on selected equipment operating widths.


Crushing and Grinding


Processing

  • Gravity separation
  • Flotation

Flow Sheet: Subscription required

Summary:

The Mato Bula processing facilities is designed to process a nominal 500,000 t/a, or 1,400 t/d, of gold-copper-bearing material from an open pit mining operation. The concentrator is designed to produce a copper concentrate containing a high level of gold and a gold concentrate produced by gravity concentration that can be sold directly. A gold-bearing by- product of the flotation process contains a sufficient level gold that will be treated using agitated cyanide leaching to maximize gold recovery. This material is planned to be treated off site at the nearby Da Tambuk process plant, which is proposed for development, or other facilities.

The conventional crushing and ball mill grinding in closed circuit with hydrocyclones are proposed for comminution. A centrifugal gravity concentrator has been incorporated in the grinding circuit to recover coarse and liberated gold particles, and a shaking table will be used to upgrade the gravity concentrate. The ball mill cyclone over ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, %  ......  Subscription required
Gold Head Grade, g/t 3
Silver Recovery Rate, %  ......  Subscription required
Silver Head Grade, g/t 0.7
Copper Recovery Rate, %  ......  Subscription required
Copper Head Grade, % 21.6
Subscription required - Subscription is required.

Projected Production:

CommodityProductUnitsLOM
Gold Metal in concentrate koz 102
Gold Metal in doré koz 176
Gold Concentrate kt 500
Silver Metal in concentrate koz  ......  Subscription required
Silver Metal in doré koz  ......  Subscription required
Copper Concentrate kdmt  ......  Subscription required
Copper Metal in concentrate M lbs  ......  Subscription required

Operational Metrics:

Metrics
Stripping / waste ratio  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Daily processing capacity  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual processing rate  ......  Subscription required
Annual processing capacity  ......  Subscription required
* According to 2018 study.
Subscription required - Subscription is required.

Reserves at April 30, 2018:

CategoryTonnage CommodityGradeContained Metal
Indicated 2,280,000 t Gold 3.74 g/t 278,000 oz
Indicated 2,280,000 t Silver 1.1 g/t 70,000 oz
Indicated 2,280,000 t Copper 0.28 % 14 M lbs
Indicated 2,280,000 t Gold Equivalent 4.18 g/t 310,000 oz
Inferred 3,010,000 t Gold 2.13 g/t 207,000 oz
Inferred 3,010,000 t Silver 2.4 g/t 237,000 oz
Inferred 3,010,000 t Copper 0.34 % 22.2 M lbs
Inferred 3,010,000 t Gold Equivalent 2.67 g/t 259,000 oz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Gold USD  ......  Subscription required *
All-in sustaining costs (AISC) Gold USD  ......  Subscription required *
Assumed price Copper USD  ......  Subscription required *
Assumed price Silver USD  ......  Subscription required *
Assumed price Gold USD  ......  Subscription required *
* According to 2018 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2018
OP mining costs ($/t milled) USD 25.6 *
Processing costs ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2018 study.
Subscription required - Subscription is required.

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
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 32.3
G&A costs $M USD 19.9
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Net revenue (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
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of April 30, 2018:
HME TypeModelQuantity
Bulldozer ....................... Subscription required 1
....................... Subscription required ....................... Subscription required 1
....................... Subscription required 3
....................... Subscription required 3
....................... Subscription required 1
....................... Subscription required 1
....................... Subscription required 15
Subscription required - Subscription is required.

Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2018
Subscription required - Subscription is required.

News:

NewsDate
East Africa Receives Final Payment in Adyabo Transaction December 2, 2019
East Africa Metals Concludes Agreement for Development Financing August 14, 2019
East Africa Metals Signs Definitive Agreement for Development Financing July 2, 2019
UPDATE: East Africa Metals Executes Binding Letter of Intent with Tibet Huayu Mining for the Financing and Development of the Terakimti, Mato Bula and Da Tambuk Deposits, Ethiopia February 11, 2019
East Africa Metals Receives Approval of Mine Permit Application for Mato Bula and Da Tambuk Gold Projects September 4, 2018
East Africa Metals announces approval of Environmental and Social Impact Assessments for the Mato Bula Gold Copper and Da Tambuk Gold Projects August 16, 2018

Aerial view:

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