Overview
Stage | Production |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Sub-level open stoping (SLOS)
- Mechanized Cut & Fill
- Unconsolidated rockfill
|
Production Start | ... |
Mine Life | 2027 |
Ore from Pilar Mine is transported by truck 40 km to the Caeté Gold Complex for processing. |
Source:
p. 15,36
Company | Interest | Ownership |
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
- Subscription is required.
Deposit Type
- Banded iron formation hosted
- Vein / narrow vein
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
- Sub-level open stoping (SLOS)
- Mechanized Cut & Fill
- Unconsolidated rockfill
Summary:
The Pilar gold mineralization occurs in a shear zone, which dips on average 50° to 60°. The mineralization is structurally complex, with intense folding and displacements (up to one metre) associated with local faulting. Consequently, the vein can change direction, pinch, and swell over relatively short distances. Though the orebody's hanging wall and footwall contacts are visually distinguishable, an assay wall can occur within the formation. The Pilar deposit extends from 250 m to 350 m along strike.
There are two mining methods in use. The current LOMP forecasts longhole mining with delayed backfill for the majority of the Mineral Reserves. Mechanical cut and fill mining is used when ore geometry does not favour longhole mining. The Pilar deposit is mined in horizons between sublevels. Each horizon is mined in retreating fashion, starting at the end of the mineralized zone, and progressing towards the central crosscuts.
Access to the stopes is provided by sublevel development driven from the ramp, with sublevel intervals of 20 m. Crosscuts near the mineralized zone centre are advanced to the hanging wall contact at each level and sublevel. From there, ore drives are driven in both directions along strike, under geological control for alignment, exposing the footwall and hanging wall contacts until reaching the limits of the deposit. This approach provides for two working faces per sublevel.
The hanging wall is supported with cable bolts bef ........
Flow Sheet:
Source:
p.266,268
Crushing
The ore from the Pilar mine 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%).
Flow Sheet:
Summary:
- subscription is required.
Reserves at December 31, 2022:
Mineral Reserves at Pilar were estimated at a cut-off grade of 2.44 g/t Au.
Mineral Resources at Pilar were estimated at a cut-off grade of 1.90 g/t Au.
Mineral Resources are reported inclusive of Mineral Reserves.
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
1,079 kt
|
Gold
|
3.82 g/t
|
133 koz
|
Probable
|
882 kt
|
Gold
|
3.78 g/t
|
107 koz
|
Proven & Probable
|
1,961 kt
|
Gold
|
3.81 g/t
|
240 koz
|
Measured
|
1,778 kt
|
Gold
|
4.5 g/t
|
257 koz
|
Indicated
|
1,235 kt
|
Gold
|
4.12 g/t
|
164 koz
|
Measured & Indicated
|
3,013 kt
|
Gold
|
4.34 g/t
|
421 koz
|
Inferred
|
2,117 kt
|
Gold
|
4.33 g/t
|
294 koz
|
HME Type | Model | Size | Quantity | Leased or Contractor | Ref. Date | Source |
Backhoe loader
|
|
|
.......................
|
|
Dec 31, 2021
|
p.262
|
Bolter
|
|
|
.......................
|
|
Dec 31, 2021
|
p.262
|
Drill (long hole)
|
.......................
|
|
.......................
|
|
Dec 31, 2022
|
p.50
|
Grader
|
.......................
|
3.6 m blade width
|
.......................
|
|
Dec 31, 2021
|
p.261
|
Jumbo
|
.......................
|
|
.......................
|
|
Dec 31, 2022
|
p.262
|
Jumbo
|
.......................
|
|
.......................
|
|
Dec 31, 2022
|
p.50
|
Loader
|
.......................
|
|
.......................
|
|
Dec 31, 2021
|
p.262
|
Loader (FEL)
|
.......................
|
|
.......................
|
|
Dec 31, 2022
|
p.50
|
Loader (mini)
|
.......................
|
|
.......................
|
|
Dec 31, 2021
|
p.262
|
Load-Haul-Dump (LHD)
|
.......................
|
10 t
|
.......................
|
|
Dec 31, 2022
|
p.50
|
Scissor Lift
|
|
|
.......................
|
|
Dec 31, 2021
|
p.262
|
Truck (dump)
|
.......................
|
29 t
|
.......................
|
|
Dec 31, 2022
|
p.50
|
Truck (dump)
|
.......................
|
29 t
|
.......................
|
|
Dec 31, 2022
|
p.50
|
Truck (haul)
|
.......................
|
30 t
|
.......................
|
|
Dec 31, 2022
|
p.50
|
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