USGS – Volcanogenic Massive Sulfide Occurrence Model


The USGS is an invaluable source of knowledge and information on economic geology (and on most Geology branches, in fact). I have just come across one of their publications; in this case, on VMS deposits – an important source of precious and basic metals (in the world and in Portugal – in our case, for over two … Continue reading USGS – Volcanogenic Massive Sulfide Occurrence Model

USGS Tantalum report (just published)


Two years ago I was involved in a very interesting tantalum project in the Republic of Congo (Brazzaville) – photo gallery here. I have since then followed with attention this metal’s market news (and its idiosyncrasies, being one of the 3TG minerals – subject to control under the conflict minerals framework). USGS just published a … Continue reading USGS Tantalum report (just published)