Brazil

Caete Complex

Click for more information

Categories

Overview

Mine TypeUnderground
StatusActive
Commodities
  • Gold
Mining Method
  • Sub-level open stoping (SLOS)
  • Mechanized Cut & Fill
Backfill type ... Lock
Production Start... Lock
Mine Life... Lock
SnapshotThe Caeté Mining Complex, includes the Pilar and Roça Grande Mines and the Caeté Plant, as well as the advanced exploration projects Catita and Córrego Brandão.

On March 22, 2018, the Roça Grande mine was placed on care and maintenance.
Related AssetsPilar Mine, Roça Grande Mine

Owners

SourceSource
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

Lock

- subscription is required.

Deposit type

  • Banded iron formation hosted
  • Vein / narrow vein

Summary:

The gold metallogeny in the Iron Quadrangle is complex, with gold mineralization predominately observed within three general types of deposits: - Archean-age, invariably stratabound-like, Algoma BIF hosted deposits. - “Quartz vein swarms-style”, clearly mesothermal deposits. - Early-Proterozoic, Witwatersrand type paleo-placer deposits. While 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 event that has taken place some time after the regional deformation event. - Other than the mineralization contained within the RG07 deposit, the gold mineralization at Roça Grande is more stratiform in nature. - Córrego Brandão mineralization is hosted in altered mafic volcanic rocks, and the higher grades appear to be associated with higher percentages of disseminated fine magnetite and quartz veins. The main sulphides are fine grained and predominately pyrrhotite and subordinate pyrite. Minor associations with arsenopyrite is also observed. - Dimensions of the economic orebodies: - Economic strike lengths of only 50 m to 350 m for individual mined zones. The average thicknesses of the BIF hosted orebodies may range from two metres to 20 m. - At Córrego Brandão the sulphide mineralization extends approximately 1,000 m along strike and 250 m down dip. The thickness of the mineralized zones may range from two metres to 20 m. MINERALIZATION Economic gold mineralization at Pilar is hosted by the folded, and locally refolded, Pilar BIF Unit including the SW Limb, São Jorge, BF III, BF II, BF, LPA, and BA mineralized zones, and by the conformably folded Torre meta-volcanic sequence. The main zones of mineralization occur as scattered, stratabound lenses (or “pods”) of sulphide-facies BIFs within the “carbonatic-oxide-facies” deposit scale Pilar BIF Unit. Economic mineralized bodies consist of stratabound, but not stratiform, concentrations of gold bearing sulphides that occur in scattered grains, seams, and irregular shaped granular aggregates located along and replacing iron carbonates-rich bands of the BIFs. Arsenopyrite and pyrrhotite are the most important sulphide minerals in mineralized bodies, with pyrite, chalcopyrite, galena, and sphalerite commonly present as accessory minerals. A direct relationship can generally be established between the amounts of arsenopyrite (percentage per volume) and the gold concentrations in mineralized BIF samples of the Pilar deposit. There is a clear temporal-spatial-genetic relationship between the epigenetic replacement/sulphidation of the host BIFs and the onset of a structurally controlled, district scale silicification event. Carbonate-rich bands of mineralized BIFs commonly exhibit sulphide enriched alteration/replacement halos that are symmetrically distributed around swarms of quartz veins and veinlets. The sulphide minerals occur predominately as disseminations in the host rocks, but can achieve semi-massive to massive concentrations locally, over a few metres. Individual quartz veins are typically less than one metre in width and can be observed to be of three generations. Quartz veins of the first generation are typically associated with the gold mineralization and are folded by the main tectonic event which affected the Pilar package as a whole. Quartz veins of the second generation are typically lower grade or barren and are not affected by folding. Lastly, quartz veining of the third generation is associated with the aforementioned extensional tectonic cleavage and may also be related to halos of mineralization/sulphidation where related to hinge structural domains. At the Pilar deposit, increased average gold grades and higher sulphide/arsenopyrite concentrations (within the economic mineralized zones and orebodies) are almost everywhere (or at least very frequently) mapped in association with the deposit scale, larger, higher-amplitude fold hinge geometries. Increased average gold grades and higher sulphide/arsenopyrite concentrations have also been observed in association with a second folding event (and/or with a subsequent third folding event) in the Pilar BIF package (Tiago Souza, 2020). The second folding event would have brought mineralized quartz veins into the BIF Pilar package, however, according to Tiago Souza (2020), the third folding event was responsible for the generation of the economic mineralization hosted by the large fold hinge geometries of the Pilar package (São Jorge synform, BF II antiform, BF antiform, BF II-BF Junction synform, BA antiform, and the smaller-amplitude Torre antiforms). At Roça Grande, gold mineralization is commonly associated with BIF horizons. In the RG01, RG02, RG03, and RG06 mineralized zones, gold mineralization is developed approximately parallel to the primary bedding and is related to centimetre scale bands of massive to disseminated pyrrhotite and arsenopyrite. In many instances, higher gold values are located along the hanging wall contact of the iron formation sequence and are hosted by carbonate-facies iron formation. Grades generally decrease towards the footwall where the iron formation becomes more silica-rich. The thicknesses of the iron formations are observed to be affected by broad scale boudinaged structures. Higher gold grades are observed in the thicker portions while the narrower portions of the boudinaged structures have lower grades. Late-stage, barren quartz veins are also ubiquitously present and display a boudinaged form. The SLR QP recommends that structural mapping information be integrated with isopach maps of the carbonate iron formation and trend analyses of the gold distribution to identify any primary controls on the distribution of the BIF hosted gold mineralization. In the RG07 mineralized zone, gold is observed to be hosted in quartz veins that are contained within a sericite (chlorite) schist associated with an east-west oriented shear zone (Machado 2010).

Reserves

Lock

- subscription is required.

Mining Methods

Lock

- subscription is required.

Comminution

Crushers and Mills

Lock

- subscription is required.

Processing

Lock

- subscription is required.

Production

CommodityUnits20222021202020192018201720162015
Gold oz  ....  Subscribe  ....  Subscribe  ....  Subscribe40,68341,78838,68633,35039,762
All production numbers are expressed as metal in doré.

Operational metrics

Metrics20222021202020192018201720162015
Daily processing capacity  ....  Subscribe  ....  Subscribe  ....  Subscribe2,050 t2,050 t2,050 t2,050 t2,050 t
Annual processing capacity  ....  Subscribe  ....  Subscribe  ....  Subscribe720,000 t720,000 t720,000 t720,000 t
Ore tonnes mined  ....  Subscribe  ....  Subscribe  ....  Subscribe
Tonnes processed  ....  Subscribe  ....  Subscribe  ....  Subscribe433,000 t377,000 t406,000 t379,000 t469,000 t
Daily ore mining rate  ....  Subscribe  ....  Subscribe  ....  Subscribe1,100 t1,300 t1,500 t1,500 t1,500 t

Production Costs

CommodityUnits202220212020201920182017
Cash costs (sold) Gold USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 811 / oz   715 / oz   993 / oz  
Cash costs Gold USD
All-in sustaining costs (sold) Gold USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 1,119 / oz   992 / oz   1,286 / oz  

Operating Costs

Currency2019201820172016
UG mining costs ($/t milled) USD 39.9  48.1  57.7  107.99  
Processing costs ($/t milled) USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe
G&A ($/t milled) USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe
Total operating costs ($/t milled) USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe

Financials

Units202220212020201920182017
Sustaining costs M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 12.4   11.5   11.2  
Capital expenditures M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 13.5   11.8   12.8  
Revenue M USD 53.2   53.1   48  

Heavy Mobile Equipment

Fleet data has not been reported.

Personnel

Mine Management

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ........... Subscription required ........... Subscription required Subscription required Aug 14, 2023
....................... Subscription required ....................... Subscription required Subscription required Dec 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 14, 2023
....................... Subscription required ....................... Subscription required Subscription required Aug 14, 2023
....................... Subscription required ....................... Subscription required Subscription required Aug 10, 2023
....................... Subscription required ....................... Subscription required Subscription required Aug 10, 2023
....................... Subscription required ....................... Subscription required Subscription required Aug 10, 2023
....................... Subscription required ....................... Subscription required Subscription required Aug 14, 2023
....................... Subscription required ....................... Subscription required Subscription required Aug 14, 2023

EmployeesContractorsTotal WorkforceYear
...... Subscription required ...... Subscription required ...... Subscription required 2021

Aerial view:

Lock

- subscription is required.