Agoracom

from corp website....

Bell Copper has identified twelve different copper minerals at La Balsa. They are loosely classified as follows:

• Highly soluble oxides, carbonates, sulfates, silicates: malachite, azurite, chrysocolla, brochantite, cuprite, and chalcanthite.
• Moderately soluble mixed supergene sulphides: chalcocite and covellite.
• Slightly soluble hypogene sulphides: chalcopyrite, and bornite.

Although the amount and distribution of these minerals varies within each deposit, a similar sequence of mineralogy is common to all. Near surface rocks are typically clay altered with a goethite-hematite assemblage along fractures and in open stockworks. Copper oxides, principally malachite and brochantite, generally increase just below the surface. Sooty chalcocite appears on fractures, replacing mafic minerals in xenoliths and along the margins of xenoliths. At depths, chalcopyrite and bornite are abundant, locally rimmed by chalcocite and occasionally covellite.