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| BRETT RESOURCES INC. : http://www.brettresources.com/ : QwikReport |
| Santa Clara |
FEATURES
Brett Resources Inc., through its wholly owned Salvadoran subsidiary Brett Resources El Salvador, S.A. de C.V., holds 100% of the mineral rights to a 47 square kilometre exploration license, located in eastern El Salvador. The license, called Cerro Bonito, was approved by the Salvadoran government in June, 2005. It is roughly 15 km in N-S extent and varies in width between 1 and 4 km in an E-W direction. It covers three distinct gold targets: the centrally located Santa Clara, Gaspar in the northern portion of the concession and Tinta Amarilla in the south. Brett identified the structural corridor that hosts the Santa Clara and Gaspar targets, and believes it could host a very significant bonanza-type low sulphidation gold vein system.
In 2006, Brett optioned the property to Kinross Gold Corporation. Kinross can earn a 66 2/3% interest in the property by expending US$5,000,000 in exploration by June 2011. The date to complete expenditures on the property has been extended by two years while Brett and Kinross await exploration permits for the property. Upon completion of the earn-in the project would be operated as a standard joint venture with each participant carrying its pro rata share of costs.
Subsequent to the option agreement the property holdings were expanded to include the 36 square kilometer Jicaras Largas license, which lies immediately adjacent to and west of Cerro Bonito. Brett has also applied for three additional exploration licenses but these applications have yet to be granted by the Ministry.
GEOLOGY AND MINERALIZATION
Santa Clara is a high-grade gold vein occurrence that projects over two kilometres along strike towards Gaspar, a high level zone of silicified volcanic rocks. Surface sampling of the Santa Clara vein returned 24.7 g/t Au over 2.3 m true width. Gaspar is localized along a north-northwest trending structural corridor approximately 4.5 km long. The Santa Clara vein system lies at the southern end of this corridor and is defined by low sulfidation adularia-sericite banded chalcedony veins with up to 114 g/t Au from dump sampling. At Gaspar, widespread, high level silicification (opaline silica - kaolinite) alteration, altered felsic flow domes and variably silicified epiclastic units (up to 3.3 g/t Au in outcrop) occur . These features collectively suggest that this structural corridor could host a very significant bonanza-type, low sulfidation vein system.
The Tinta Amarilla prospect lies approximately five kilometers to the southwest of Gaspar and covers an area of five square kilometers. The prospect geology is characterized by a dacitic flow dome complex that has been extensively altered to argillic and silicic assemblages. Intermediate flows, tuffs and volcaniclastic units flank this complex to the north. Northwest-trending structures cut both the flow dome complex and the intermediate volcanics at two distinctly contrasting erosional levels. At higher elevations, the structures host silicification in the dacitic rocks whereas in the intermediate volcanics, at lower elevations, they give way to quartz-adularia-illite-pyrite alteration associated with gold bearing, banded adularia-chalcedony veins up to 1.4 meters in width. Surface values up to 19.4 g/t Au and 721 g/t Ag have been obtained from these veins.
EXPLORATION HISTORY
At the Santa Clara prospect, an epithermal, low sulfidation, banded quartz-adularia vein system is developed in a rift-related volcanic sequence. Although outcrops of the vein are limited, intersections in three shallow core holes completed by Brett at the Santa Clara prospect during 1998 returned gold grades up to 26.5 g/t over 0.90 m, along with strongly colloform-banded vein textures, similar to textures reported at Hishikari, Sleeper, Midas, and El Peņon. Geologic mapping and rock chip sampling in 2006 defined a north-northwest trending structural corridor and fault zone which localizes gold/silver mineralization.
Portions of Tinta Amarilla were explored for a near surface, bulk tonnage target in 2000. Fifteen reverse circulation holes, to a maximum depth of 181.4 m were drilled, totaling 1,625 meters. While the drilling results were viewed as discouraging for a near surface bulk mineable deposit, up to 1.5 meters of 12.6 g/t Au and 424 g/t Ag were identified in the drilling along with several pyrite-illite-adularia + banded chalcedony vein zones and can be considered a discovery of a potential high grade vein system.
In 2006, Brett completed fourteen HQ diamond drill holes, totaling 1,692 meters, on the Tinta Amarilla and Santa Clara targets. Tinta Amarilla results demonstrate that the vein system is considerably more extensive in the subsurface than earlier work had indicated. Down-dip extensions of the Alacran vein, the principal structure evaluated by the program, frequently exhibit an increase in both grade and thickness at depth. In outcrop the structure appears as a 0.25 to 1.20 m wide, north-northwest-striking (330°), west-dipping, banded vein which assays 2 to 6 g/t gold, and 30 to 200 g/t silver. In the subsurface (some 70 to 120 m deeper) the true width of the vein is commonly 2 to 6 m; gold values are generally in the 3 to 15 g/t range, and silver is frequently in 150 to 600 g/t range. The sub-parallel Domingo vein, located approximately 30 m to the west of the Alacran structure and intersected in the upper portion of CB-13 (35.05 to 42.70 m), is a blind discovery beneath a covered area.
The chalcedonic and sometime vuggy nature of the silica at both Santa Clara and Tinta Amarilla suggests that the drilling to date has only tested the upper portions of the mineralizing systems. Additional drilling is proposed as soon as new drilling permits are obtained. An environmental permit for drilling has been withheld while the government evaluates its policies with respect to mining development.
Santa Clara - Maps
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| Copyright © 2010 by Brett Resources Inc. All rights reserved worldwide. |
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