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Brazil
Boa Esperanca Project

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 Location:
40 km SW from Tucumã, Brazil

  Project Contacts:
Fazenda Caraíba, S/N
Jaguarari
Brazil
BA 48967-000
Phone  ...  Subscription required
Fax55-74-3532-8310
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageFeasibility
Mine TypeOpen Pit
Commodities
  • Copper
Mining Method
  • Truck & Shovel / Loader
Processing
  • Flotation
Mine Life9 years (as of Jan 1, 2017)
As at December 31, 2018, Ero and its subsidiaries employed a total of 1,935 employees (consisting of 11 employees of Ero, 1,656 employees of MCSA, 261 employees of NX Gold, 4 employees of Mineração Boa Esperança S/A and 3 employees of Ero Copper (US) Ltd.) and 1,418 contractors (consisting of 7 contractor of the Company, 1,197 contractors of MCSA and 214 contractors of NX Gold).


Owners

Source: p. 3
CompanyInterestOwnership
Ero Copper Corp. 99.6 % Indirect
MCSA acquired the Boa Esperança copper deposit concession from Corporación Nacional del Cobre (Codelco) in 2007 and became the legal owner of the mineral rights to the Boa Esperança copper deposit. In December 2016, Ero acquired approximately 85.0% interest in MCSA. In June 2017, Ero acquired an additional 14.5% by subscribing for shares from treasury for a total interest in MCSA of approximately 99.5%.

Deposit Type

  • IOCG


Summary:

The presence of magnetite (iron) in the breccias hosting the copper mineralization suggests a deposit type classified as IOCG (Iron Oxide Copper Gold). However, there are many features that do not match the proposed IOCG deposit type. Among these is the presence of high-sulfur mineral assemblage (chalcopyrite-pyrite), rather than the low-sulfur copper sulfide mineral assemblage characteristic of the IOCG deposit type (chalcopyrite - bornite - chalcocite), as well as the high quartz content, the absence of pervasive hydrothermal alteration of the host rock, in particular sodic (albite) alteration, and the absence of gold.

As such, the Boa Esperança copper deposit is a variant of an IOCG deposit type.

Mineralization consists of a series of brecciated zones, which are aligned N60°-70°E and incline in a SE direction (60°-70°SE). However, another alignment of about N40°E was observed in the field and coincides with the elongation of the Boa Esperança hill.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Boa Esperança is a copper deposit, averaging approximately 0.95% Cu diluted grade within the minable pit. The mineralization is close to the surface and the resource is appropriate for an open pit mining operation.

The final pit design in this feasibility phase of the Boa Esperança project totals 19.5 Mt of Proven and Probable Mineral Reserves with an average diluted grade of 0.95% Cu. From this total, 17.5 Mt is classified as high grade material with an average Cu content of 1.02% and the remaining 2.0 Mt as low grade material, with a grade of 0.34% Cu.

Waste materials amount to 37.7 Mt, which is comprised of 19.6 Mt of saprolite, 8.9 Mt of weathered rock and 9.2 Mt of fresh rocks. The Life of Mine (LOM) strip ratio of waste to ore is 1.93.

The operation of the Boa Esperança mine will utilize conventional open pit mining techniques and small size mining equipment to mine a total of 57.2 Mt of material over the life of the mine. This comprises 19.5 Mt of ore and 37.7 Mt of waste materials. A total of 5.1 Mt of ore will be moved from the stockpiles to the plant.

The main mine equipment selected for the Boa Esperança project consists of 4.0 m3 hydraulic
excavators, on-highway 35t trucks and drills.

It has been assumed that 100% of weathered and fresh rocks and 10% of saprolites will be drilled and blasted in 10-meter-high benches. Ore will be hauled to the primary crusher or to the ROM stockpiles close to the primary crusher. Waste materials will be hauled to different dumps and destinations. Grade control will be performed through drilling, sampling and assaying materials within the pit limits using the production drills.

The mine is scheduled to operate in three 8 hour shifts, 7 days per week, 365 days per year. Whenever mine production needs to be reduced or interrupted, the primary crusher will be fed from the regularization pile using a front-end loader.


Crushing and Grinding


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

The Boa Esperança concentrator has been designed to process 2.308 Mt of copper ore per year at a nominal processing rate 9,033.6 tonnes per day (t/d) at primary crushing feed and incorporates equipment and process unit operations considered standard for the industry. The process flowsheet includes three-stage crushing, jigging, ball mill grinding, copper rougher flotation, two stages of copper cleaner flotation and pyrite flotation from the copper rougher and scavenger flotation tailing. The final copper concentrate is thickened prior to pressure filtration and the flotation tailing is thickened and classified prior to discharge to the tailing storage facility. The pyrite concentrate from the pyrite flotation is sent to the pond of high sulfur. The flowsheets and material balances have been prepared as part of the Tecnomin’s process design.

Recoveries & Grades:

CommodityParameterAvg. LOM
Copper Head Grade, % 0.95
Copper Recovery Rate, %  ......  Subscription required
Subscription required - Subscription is required.

Projected Production:

CommodityProductUnitsLOM
Copper Payable metal M lbs 346
Copper Metal in concentrate M lbs 360
Copper Concentrate dmt 544,775

Operational Metrics:

Metrics
Daily milling rate  ......  Subscription required
Stripping / waste ratio  ......  Subscription required
Annual mining capacity  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Annual milling capacity  ......  Subscription required
* According to 2017 study.

Reserves at September 7, 2017:

CategoryTonnage CommodityGradeContained Metal
Proven 18.5281 Mt Copper 0.96 % 178.05 kt
Probable 0.975 Mt Copper 0.72 % 7.02 kt
Proven & Probable 19.5031 Mt Copper 0.95 % 185.07 kt
Measured 41 Mt Copper 0.81 % 332,100 t
Indicated 26.17 Mt Copper 0.62 % 162,254 t
Measured & Indicated 67.17 Mt Copper 0.73 % 490,341 t

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Copper BRL 1,593 / t *
Assumed price Copper USD 2.98 / lb *
* According to 2017 study / presentation.

Operating Costs:

Units2017
OP mining costs ($/t mined) BRL 15.7 *
Processing costs ($/t milled) BRL  ......  Subscription required
Total operating costs ($/t milled) BRL  ......  Subscription required
* According to 2017 study.
Subscription required - Subscription is required.

2017 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M BRL  ......  Subscription required
Sustaining CapEx $M BRL  ......  Subscription required
Closure costs $M BRL  ......  Subscription required
Total CapEx $M BRL  ......  Subscription required
OP OpEx $M BRL  ......  Subscription required
Processing OpEx $M BRL 375.7
G&A costs $M BRL 186.1
Total OpEx $M BRL  ......  Subscription required
Gross revenue (LOM) $M BRL  ......  Subscription required
Net revenue (LOM) $M BRL  ......  Subscription required
After-tax Cash Flow (LOM) $M BRL  ......  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 June 1, 2017:
HME TypeModelSizeQuantity
Backhoe ....................... Subscription required 4 cu. m 3
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required 3
....................... Subscription required ....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required 12
....................... Subscription required ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 2, 2019
....................... Subscription required ....................... Subscription required Subscription required Jun 2, 2019
....................... Subscription required ....................... Subscription required Subscription required Jun 2, 2019
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2018
Feasibility Study Report 2017
Subscription required - Subscription is required.

Aerial view:

Subscription required - Subscription is required.

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