Geology

Introduction We often find references to veins, dikes (or dykes) and sills in descriptions of mining projects or in news releases. They may host economic minerals, relate to important project ...

Introduction A magmatic arc hydrothermal system is a class of hydrothermal systems that interlink major styles of precious metal and base metal deposits. These deposits include well known types like ...

Introduction Flying over Nevada on a clear day is one of the great joys of being an economic geologist. The Basin and Range country has abundant structural features, intrusions, deformed ...

Located in the Mount Isa inlier of Queensland, Australia, the Mt Isa deposits represent the largest accumulations of lead, zinc and silver in the world. The first deposits were discovered ...

Although cobalt (Co) is well known for the blue dyes that bear its name, metallic cobalt is a lustrous silver-grey. Metallic cobalt is ferromagnetic (can be magnetized) and has a very high ...

Introduction Molybdenum (Mo, Atomic number 42) is a silvery grey metal, notable for its extremely high melting point (2623°C). It has many uses in the aerospace, military and petroleum industries, ...

Introduction The gold fields of the Witwatersrand Basin in South Africa are, by a landslide, the largest single gold producing district in the world. It has produced some 2 billion ounces ...

Limestone is one of the most important and versatile industrial mineral commodities. It is a crucial mineral in the making of Portland cement and mortar, but is also used in ...

Lithium (Li) is a metallic element that is most often found in granitic “pegmatites” (intrusive igneous rocks), brines (salty solutions), seawater and clays. In it’s pure form it is soft light silver ...

In Grasberg Part 1 we discussed the social and cultural aspects of the Grasberg deposit and outlined it’s long and fascinating history. In this article we’ll dig into the geology of this ...