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Projects
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Yura Project - Arequipa, Peru
Summary
Road & bench cuts - Yura
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The Yura mining district is located some 40 kilometers west of the city of Arequipa, Peru. Arequipa is a mining and tourism center for southern Peru with a population of 1 million, with international airport service. A number of mineral exploration concessions have been acquired and are fully constituted. These concessions cover portions of a large granodioritic batholith which is hostrock to a series of sheer zones containing important values of free milling gold. This district has the potential to host large tonnage discriminated gold deposits that could be open pit mines and heap leached.
The deposits are found between 1200 to 2400 meters above sea level, where weather is favorable for year around mining. The Chili and Yura rivers converge on the southern portion of the properties, forming the Vitor River. These rivers drain along deep faults which expose the batholith to depths of 300 meters, and up to 600 meters on the southwestern portion of the property. Some of the mineralized zones are traceable downs strike to the river bottom. The minerazied zones have long stroke length that are traceable for hundreds of metres up to more than a kilometre, many of which are vertical to semi-vertical, with long strikes traceable over hundreds of meters, and in some cases more than a kilometer.
Zoro has acquired a 100% interest in a mining block comprising 4,942 hectares of titled mining property known as Yebacha.
Local geology
The local host rock is a massive granodioritic to granitic, course grained porforidic intrusive body covering an area larger than 100 square kilometers, consisting of equi-granular quartz, plagioclase and potassic feldspars, with elongated hornblende and biotitic phenocrysts up to 3 cms in length.
Mercedes vein drift - Yura |
This intrusive hostrock is cut by a series of fine to medium grained quartz-feldspar high angle dikes which strike N to E.NE.
The principle structural control appears to be a series of slip-strike left lateral faults and fractures, related to a regional zone of shearing which trends x N35W and dips > 60SW.
The shear zones at the eastern portion of the property are more heavily propitilized, and the host rock at the level of the river has more epidote and clays.
Gold Mineralization
Gold mineralization at the surface has been picked at over the years by informal miners, down to a depth of 10 meters or so, at which excessively point winching the ore and the waste rock from the shaft becomes labor intensive. The bulk of the gold mineralization appears to be free milling, simple crushing and hand panning reveal the gold to be slightly finer than table salt, ideal for heap leachous.
Gold
The Yura mining district is virtually undeveloped despite its close proximity to Arequipa. The steep terrain and lack of access roads have discouraged small and medium sized companies from developing the area.
To date, only rudimentary mapping and sampling have been carried out at Yura, covering only a small portion of the property under claim. Prior mining activity in the area is limited to a few existing pits and stopes, largely to depths of 10 meters or less, most of which are found on the more accessible southern flank of both the eastern and western portion of the property. The central and northern portions of Yura are even less developed because the distance to the nearest road is several kilometers.
These shear zones are most obvious along the adjacent slopes of the hill crests and peaks, which do not have the alluvial float covering of the lower slopes. Within these shear zones, the large blocks of country rock have been significantly reduced in size, down to small rubble, and many times quartz float or outcrops are visible. Since only a small portion of the property has thus far been explored, it is likely that the majority of the quartz veins shear zones at Yura are yet to be discovered.
Development Plan
Boulder Resources currently has a mining camp in the Mercedes area, and is building roads in the area for truck access. Preliminary rights have been obtained to as much as 3,000 cubic meters per day of water near the Yura mines, and surface rights are in the process of being obtained for eventual plant site.
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