Arsenopyrite is an iron arsenic sulfide (FeAsS). It is a hard (Mohs 5.5-6) metallic, opaque, steel grey to silver white mineral with a relatively high specific gravity of 6.1. When dissolved in nitric acid, it releases elemental sulfur. When arsenopyrite is heated, it becomes magnetic and gives off toxic fumes. With 46% arsenic content, arsenopyrite, along with orpiment, is a principal ore of arsenic. When deposits of arsenopyrite become exposed to the atmosphere, usually due to mining, the mineral will slowly oxidize, converting the arsenic into oxides that are more soluble in water, leading to acid mine drainage.
Arsenopyrite also can be associated with significant amounts of gold. Consequently it serves as an indicator of gold bearing reefs. Many arsenopyrite gold ores are refractory, i.e. the gold is not easily liberated from the mineral matrix.
Planet Exploration Reports 5.4 Metres of 3.54 Grams Per Tonne Gold; and 13.22 Grams Per Tonne Gold Over a Metre, as Part of 4,400 Metre Drilling Program at the Upper Duck Zone ; - Total of 46 holes and 15,730 metres of drilling now completed on UDZ - Arsenopyrite and Silica relationship identified with high grade mineralization in UDZ - Winter drilling expected to commence in early 2008 with Goldcorp Red Lake Gold Mines as operator - Permitting underway for Advanced Exploration Program at Sidace Lake
Jan 09, 2008; CALGARY, ALBERTAMarketwire - Jan. 9, 2008) - Planet Exploration Inc. (TSX VENTURE:PXI) is pleased to announce additional results...