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San Pedro Corralitos, Chihuahua, Mexico

The district of San Pedro Corralitos is located in the municipality of Nuevas Casas Grandes in the northern part of Chihuahua, Mexico. The mines are in a low area that has an arid and desertic climate and is very close to the Rio Grande. The first modern extraction operation in the area was in the Mina del Congreso in 1855. The mine was purchased by E.D. Morgan along with a group of investors from New York. Together they formed the mining company called ‘Candelaria’. These were not the first digging operations but they were the most important ones. The company controlled 1157 hectares of land and during the time it operated there was a period of continuous growth that lasted until 1913. The small land tenants, on the other hand, maintained only small surface operations. In the end it was not the Revolution but water that caused problems: due to the presence of underground flow the mine could never be below 400 feet even with the use of powerful pumping systems.
In 1926, the company Peñoles signed a contract to share its work and benefits. With this, the mining work began again bolstered by the discovery of new deposits that were of difficult access. The exploration activities continued and they managed to drill below the level where the water had been evacuated albeit with great difficulty. Because of the resulting low profitability the operations were stopped in 1953 even though the mine was producing large quantities of mineral. Today the mine is still working. During its productive years San Pedro Corralitos yielded a total of nearly one million tons of oxide that contained 7% of lead, 7% of zinc, 1.5% of copper, 219 grams of silver per ton and between one and six grams of gold per ton.
There was, however, a discovery of mimetite in 1968 that caused considerable stir amongst the collectors of specimens. The problem was that it was in the lower parts that were almost completely flooded. Despite this, they ventured to get the best pieces until they reached a big gallery that opened from within the vein like a throat covered in crystals. The world of mineral collectors stood in amazement before the beauty of the exquisite specimens.
The rocks of San Pedro Corralitos are made of limestone and cretaceous whiteboard with bits of eruptive rocks injected in them. The contact zones between these in the southern part of the district created some orebroites that contained copper, zinc, gold and silver. The mineralization occurred in two general areas: San Pedro Corralitos in the south side of the San Pedro peak and northwest of the peak in Candelaria. It is believed that many beautiful species of minerals were crushed during the production year. It was not until the discovery of Benny Fenn that the rocks began to be collected. Thanks to this the public can now observe them in museums and collections.

Mimetite from San Pedro Corralitos, Chihuahua, Mexico.Luis Lyons photo

Mimetite Close UpLuis Lyons photo

The yellow crystals of mimetite from other countries have been considered to be the best quality, but the botroidal specimens found in 1968 in San Pedro Corralitos, Chihuahua are truly special for their own characteristics and beauty.