Indian Mountain is one of the seven classic turquoise mines of Nevada as defined by Bob Brucia in Turquoise Jewell of the Southwest featuring his NevadaGem Collection. It is a more recent location and has not been extensively mined making it a rare turquoise. The history is found in Turquoise in America Part Three, The Stories of Turquoise  1990-2020.
 
This cab weighs 15.6 carat and measures 3cm X 1.5cm. It is priced at $100 a carat or $1560. It is not treated and is backed. I have assigned a TG of 91 or GG. This stone is from the Callais Collection.