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Location: 58 km E from San Ignacio, Mexico, Mexico
Tramo Santa Rosalia A San Ignacio Km 5. 5Santa RosaliaBaja California Sur, Mexico23920
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Camrova owns 6.91 % of the Boleo copper mine in Mexico, which is majority owned by KOMIR.
Minera y Metalúrgica del Boleo, S.A. P.I. de C.V. is a consolidated subsidiary of the KOMIR and is the operator of the Boleo project.
The Boleo deposits occur within a Miocene rift zone basin and consist of a succession of fine to coarse clastic sedimentary rocks characterized by a number of coarsening upward cycles of deltaic deposited sediments. Faulting is common throughout the district.The dominant faults are steeply dipping normal faults striking northwest and downthrown to the west by up to 200 meters (m). These offsets, combined with the easterly dip of the mantos, yield a stepwise configuration of the mineralized beds. Major faults are typically separated horizontally by several hundreds of meters, although lesser faults are common and are more closely spaced. The extensive faulting, with vertical offsets ranging from less than a meter to tens of meters, divides the project area into relatively small, irregularly-shaped blocks. The ground immediately adjacentto fault zones is generally observed to be degraded, with little or no structural strength. The surface topography is highly variable and= consists of flat-topped mesa structures that are deeply incised by rugged, steep-sided arroyos. The depth of cover varies from zero to several hundred meters.Copper-cobalt-zinc mineralization occurs throughout the Boleo District within clay-rich horizons or beds known as “mantos.” The mantos correspond to the lower units of similar stratigraphic sequences occurring in a repeated series. Each sequence consists of a general coarsening of the sediments from the base to the top. The ore-bearing mantos are the lowest beds in each sequence and consist of a 1-m-thick basal laminated mud horizon overlain by mineralized slump breccias up to 20 m thick. The ore zones are overlain by progressively coarser material of tuffaceous claystone, siltstone, sandstone, pebbly sandstone, and eventually cobble- to bouldersized conglomerates. The contact between the mantos and floor rocks is sharp; however, the contact with the roof rocks is more traditional. Mineralization is finely disseminated in the breccias with the richest material occurring in the laminated basal section of the mantos. The Boleo District has been extensively mined by underground methods for nearly a century, and much of this early mining extracted only the very high-grade material within the basal part of the manto and backfilled the stopes with the lower grade breccias, containing copper grades of 1% to 2%, or more.
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