Trail and Frood Stobie should be excellent candidates since instrumentation was limited until the late 1960ies. Pyrrhotite is 5 times as reactive as pyrites so extracting minerals/reducing acid-mine-water should be a challenge economically.
@jaimehaynes428 Жыл бұрын
Nice one pal 😀! You are missing out > 'PromoSM' !!