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Colombia
San Ramon (Santa Rosa) Mine

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 Location:
47 km NE from Santa Rosa de Osos, Colombia

  Address:
Calle 7 Sur No. 42 - 70, Ed. Forum Office #1903
Medellin
Colombia
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
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  • Reserves
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  • Filings & News

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Overview

StatusInactive / Suspended
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Mechanized Shrinkage with Delayed Fill
Mine Life8 years (as of Jan 1, 2014)
The Company commenced construction of the San Ramon Gold Mine and Mill in August 2015 after completing a positive feasibility study in October 2014, followed by completion of permitting in March 2015 and project financing in August 2015. Construction and commissioning of the mill was completed in Q4 2016, however, development of the underground mine was not complete. Five kilometres of underground development and 16,000 metres of underground infill drilling were completed during 2017. Development and infill drilling facilitated stope mining to recommence in Q4 2017 and the mill to restart on January 2, 2018. Mining rates increased quarter over quarter since Q4 2017, until the mine contractor scaled back operations in June 2018 due to financial constraints.


Owners

Source: p. 20
CompanyInterestOwnership
STRACON GyM S.A. (operator) Indirect
Red Eagle Mining Corporation 100 % Indirect
Red Eagle Mining de Colombia SAS 100 % Direct
Red Eagle Mining holds a 100% interest in the project.

Contractors

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Deposit Type

  • Vein / narrow vein


Summary:

Gold mineralization in the Santa Rosa Gold Project has characteristics in common with mesothermal or orogenic and intrusion-hosted gold veins. Mineralization of these types consists commonly of quartz and quartz-carbonate veins located in moderately to steeply dipping, brittle-ductile shear zones and locally in shallow-dipping extension fractures. Veins commonly extend along strike and down dip over very significant distances and occur alone or, typically, in complex vein networks and shear zones. Vein minerals are mostly quartz and carbonates with minor native gold, pyrite, and base metals sulfides. Veins are usually massive or ribbon-textured, but vein breccias and drusy, crystalline quartz can also occur. Wall-rock alteration is zoned and consists of carbonate (often ankerite), sericite, and pyrite.

Hypogene gold mineralization within the Santa Rosa Gold Project is generally associated with the shear zones developed in homogeneous diorite country rock, with higher grades occurring in the associated sulfide-mineralized quartz veins or as steep high-grade quartz-sulfide veins. There are also related saprolitic gold deposits and colluvial gold deposits, both of which have been mined by artisanal miners underground and in hydraulically mined areas known locally as “baticiones.” The shear zones and veins are best exposed in adits and baticiones.

In the San Ramon deposit shear zone, mineralization occurs in fractured, brecciated, and ductily deformed rock. ........


Mining Methods

  • Mechanized Shrinkage with Delayed Fill


Summary:

The mining method selected is Mechanized Shrinkage with Delayed Fill (“MSDF”). The method is similar to mechanized cut and fill but uses breast blasting of the back between lifts. Then, rather than mucking of ore and backfilling immediately, the MSDF method leaves the ore in place in the stope, only removing enough material from the stope to remove swell (similar to shrinkage stoping but removing the swell from the top instead of the bottom). Access to the stope is provided by establishing an attack ramp. For each
lift, the attack ramp back is blasted to establish access for the subsequent lift. Support is placed in the stope as needed during the drilling and blasting cycle of each lift. Once enough lifts have been drilled and blasted, the ore will be mucked out completely. The last cycle of mining for MSDF stopes is backfilling of the stope from the bottom up, progressively backfilling the attack ramp as well.

Backfill is to be used as required, but not all stopes will be fully backfilled. The backfill will consist of filtered tailings and development waste rock. Tailings will be placed in a single lift, and once the lift of tailings is placed, then a lift of waste rock from development will be placed on top of the tailings. The amount of waste placed on top of the tailings will be sufficient to allow equipment to drive on top of the backfill. It has been assumed that 60% tailings and 40% development waste rock will be a suitable mixture of tailings to waste ........


Crushing and Grinding


Processing

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Summary:

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Production:

CommodityUnitsAvg. Annual (Projected)LOM (Projected)
Gold oz 50,620387,678
All production numbers are expressed as metal in concentrate.


Reserves at October 27, 2014:

CategoryTonnage CommodityGradeContained Metal
Proven 429,000 t Gold 5.93 g/t 82,000 oz
Probable 1,995,000 t Gold 5.04 g/t 323,000 oz
Proven & Probable 2,425,000 t Gold 5.2 g/t 405,000 oz
Measured 678,000 t Gold 4.27 g/t 93,000 oz
Indicated 3,475,000 t Gold 3.46 g/t 386,000 oz
Measured & Indicated 4,153,000 t Gold 3.59 g/t 479,000 oz



Proposed Heavy Mobile Equipment as of September 27, 2014:
HME TypeSizeQuantity
Drill jumbo (single boom) ....................... Subscription required
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Subscription required - Subscription is required.

Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Management Discussion & Analysis 2018
Press Release 2018
Feasibility Study Report 2014
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