DEMONSTRATION PHOTOGALLERY
It is recommended that you view Data Metallogenica photogalleries
using Microsoft Internet Exlorer Version 5.5 or higher, and a screen resolution
of 1024 x 768. Click on any thumbnail to view the image at full size. This
gallery contains several types of data from more than one deposit which is
not normally the case. In practice, galleries are specific to deposit and
data type (eg plan, field, measurement), and introduced by a description:
an example of which follows for Las Cruces:-
The Las Cruces copper deposit is located
20 km northwest of Seville, in the Autonomous Region of Andalusia, Spain.
It is concealed under a cover of approximately 160 m of sediments and was
discovered in 1994 by the use of gravity surveying. The current (2003) owners,MK
Gold Company, plan open pit mining, leaching of ore, and production of cathode
copper for sale to the European market. The deposit is probably early Carboniferous
in age (~350 million Ma). Host rocks are volcanic tuffs and black shales with
mineralisation having the typical Iberian Pyrite Belt characteristics of:-
(1) massive base metal sulphides with trace silver and gold; (2) pyrite stockwork
beneath massive mineralisation; (3) deformation, faulting, and extensive chlorite-sericite
alteration; (4)metal zonation (Cu-rich and Zn+Pb-rich parts). In addition,
uplift, weathering, and partial exposure have created a high grade supergene
copper zone near the top of the orebody which includes gossan, precious metal
concentration, and silicification of thehanging wall. The main Massive Sulphide
(MS) unit is up to 100m thick, strikes broadly E-W over >1km and is thickest
to the west.
