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Brazil
Roça Grande Mine (Caete Complex)

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 Location:
8 km SE from Caeté, Brazil

  Regional Office:
R. Andaluzita, 131 - 7th floor
Belo Horizonte
Brazil
30310-030
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WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Mechanized Cut & Fill
Production Start...
On March 22, 2018, the Roça Grande mine was placed on care and maintenance. The Company has commenced a review of the Roça Grande asset with a view to evaluating the various financial and technical scenarios that might lead to the future recommencement of production from this area.


Owners

Source: p. 15,36
CompanyInterestOwnership
Jaguar Mining Inc. 100 % Indirect
Mineração Serras do Oeste Ltda. (operator) 100 % Direct
The Caeté Mining Complex is owned and operated by Jaguar’s wholly-owned subsidiary, Mineracão Serras do Oeste (MSOL).

Contractors

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Deposit Type

  • Vein / narrow vein
  • Banded iron formation hosted


Summary:

The Pilar and Roça Grande deposits are examples of the Algoma BIF hosted type, Córrego Brandão is a folded and sheared deposit hosted in carbonate-quartz-chlorite schists with iron occurrences. The main geological characteristics of this group are summarized as follows: - Main host/fertile “Algoma type” BIF Units: These units host the mineralization and are stratigraphically located at the waning stages of major volcanic cycles of the Rio da Velhas greenstone belt. They are overlain by later sedimentary rocks composed of greywackes and turbidites. - Mineralization style: - The mineralization consists of predominately “lateral” replacements/sulphidations of the iron carbonate-rich bands of the host Algoma type BIF units. The BIF hosted gold mineralization at Pilar, however, is not syngenetic in nature (in relation to the deposition of the host rock packages), rather it is clearly an epigenetic event that has occurred after the formation of the host rock units. There is a clear temporal-spatial-genetic relationship between the replacement/sulphidation of the host BIFs and the onset of a structurally controlled, district scale silicification event at Pilar. Textural observations suggest that at least two episodes of quartz veining has occurred. The early stage veining is deformed by the regional strain and clearly pre-dates the deformation event. The later stage veins are observed to crosscut the strain-related fabrics and so are interpreted to represent a younger mineralizing ........


Mining Methods

  • Mechanized Cut & Fill


Summary:

In March 2018, as part of refocusing its attention on improvements to the Turmalina and Pilar mines, and exploration growth activities, the Company made a strategic decision to suspend its Roça Grande mine operations. The Company has commenced a review of the Roça Grande asset with a view to evaluating the various financial and technical scenarios that might lead to the future recommencement of production from this area.

The Roça Grande mining activity has historically focused on surface exposures of gold deposits, where the orebody outcropped. The outcrops were mined using open-pit mining techniques, with exploration focused solely on the immediate down-dip projection of gold mineralization, and minimal exploration along strike between the outcrops. Underground, the RG operations team continues to evaluate more effective methods to mine the 1–2 m wide veins without excessive dilution, using a frontal-attack mechanized cut-and-fill mining method.


Crushing and Grinding
Flow Sheet: Source

Crushing The ore from the Pilar and Roça Grande mines is transported by trucks to the crushing circuit and placed in the ROM stockpile. The crushing circuit is made up of a CJ411 - 111 kW primary jaw crusher in open circuit, and secondary (CH440-223 kW) and tertiary (CH440 223 kW) cone crushers operating in closed circuit. The ROM stockpile ore is fed to the jaw crusher with a front end loader though a grizzly and vibrating feeder. The jaw crusher discharge feeds a multi deck screen (3,500 mm x 1,800 mm – with three panel decks consisting of apertures of 75 mm, 35 mm, and 16 mm respectively top to bottom), the undersize of each deck feeds secondary crushing, tertiary crushing, or the final product conveyor respectively. The secondary cone crusher operates in closed circuit with a double deck screen (5,700 mm x 2,400 mm – with two panel decks consisting of 35 mm and 16 mm apertures). Product from the double deck screen either recirculates back to the secondary crusher, feeds the tertiary crusher, or goes to the final product conveyor. The tertiary cone crusher operates in closed circuit with a single deck screen (3,500 mm x 1,800 mm – with a panel deck aperture of 16 mm), with the oversize recycling to the crusher and undersize product going to the final product conveyor, which discharges onto the crushed ore stockpile. The final particle top size of the crushing process is 16 mm. Grinding The grinding circuit consists of a 2240 kW ball mill (5 m x 6 m EGL) with a capacity of up to 100 tonnes per hour, operating in closed circuit with a series of hydrocyclones. The overflow from the hydrocyclones (-200 mesh or -74 µm) proceeds to the flotation circuit, and the underflow (+200 mesh or +74 µm) either feeds the gravity concentration circuit (75%) or is recycled to the ball mill feed (25%).


Processing

Flow Sheet: Subscription required

Summary:

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Production:
On March 22, 2018, the Roça Grande mine was placed on care and maintenance.

CommodityUnits20182017201620152014
Gold oz 8704,6685,46610,52111,783
All production numbers are expressed as metal in doré.
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Operational Metrics:

Metrics20182017201620152014
Daily ore mining rate 200 t200 t500 t500 t
Ore tonnes mined 12,000 t69,000 t89,000 t156,000 t157,000 t
Tonnes processed 11,924 t68,402 t89,000 t160,000 t175,000 t

Reserves at December 31, 2022:
Roça Grande currently has no Mineral Reserves, and the mine remains under care and maintenance.
Mineral Resources at Roça Grande is estimated at a cut-off grade of 1.8 g/t Au.

CategoryTonnage CommodityGradeContained Metal
Measured 197 kt Gold 3.42 g/t 22 koz
Indicated 765 kt Gold 4.02 g/t 99 koz
Measured & Indicated 962 kt Gold 3.9 g/t 121 koz
Inferred 889 kt Gold 4.08 g/t 117 koz

Commodity Production Costs:

CommodityUnits201820172016
Cash costs (sold) Gold USD 1,230 / oz   1,422 / oz   1,425 / oz  
All-in sustaining costs (sold) Gold USD 1,230 / oz   1,743 / oz   1,648 / oz  

Financials:

Units20172016
Sustaining costs M USD 1.4   1.2  
Capital expenditures M USD 1.6   1.3  
Revenue M USD 5.6   6.8  



Heavy Mobile Equipment:

Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2023
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2023
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2023
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Corporate Filings & Presentations:

DocumentYear
Annual Information Form 2022
Management Discussion & Analysis 2022
Quarterly Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
Annual Information Form 2018
Press Release 2018
Technical Report 2018
Annual Information Form 2017
Management Discussion & Analysis 2017
Annual Information Form 2016
Management Discussion & Analysis 2016
Technical Report 2016
Annual Information Form 2015
Management Discussion & Analysis 2015
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