Hidden Valley is a little known mine. The story is told in Turquoise in America Part Two 1910-1990 and Part Three The Stories of Turquoise 1990-2020.
 
These three cabs weigh 14 carats. The two larger cabs measure about 1.5cm X 1cm and the smaller is 0.75cm in diameter. They are priced at $30 a carat or $420. They are not treated and backed. I have assigned a TG of 82 HG  High Grade. Hidden Valley is seldom found in the marketplace especially at this grade. I purchased this stone from Wayne Nelson.