Cinnabar akin to that of HgO: each Hg center has two short Hg−S bonds (each 2.36 Å), and four longer contacts (with 3.10, 3.10, 3.30, and 3.30 Å separations). In addition, HgS is found in a black, non-cinnabar polymorph (metacinnabar) that has the zincblende structure. Cinnabar generally occurs as a vein-filling mineral associated with recent volcanic activity and alkaline hot springs. Cinnabar is deposited by epithermal ascending aqueous solutions (those near surface and not too hot) far removed from their igneous source. It is associated with native mercury, stibnite, realgar, pyrite, marcasite, opal, quartz, chalcedony, dolomite, calcite and barite. Cinnabar is
Kudremukh Iron Ore Company December 2001. Kudremukh area is a biodiversity hotspot, with Kudremukh national park nearby. The mining lease was temporarily extended, however, it was completely stopped in 2006 due to environmental reasons. In 2016 KIOCL planned to develop a commercial resort in the Kudremukh national park, refurbishing some of its buildings, unused since the closure of the mine. The project had not obtained an environmental clearance. In October 2016 the Ministry of Environment and Forests ordered to immediately stop the work. Kudremukh Iron Ore Company KIOCL Limited, formerly Kudremukh Iron Ore Company Limited is a Government of India enterprise with its head