A handy app for the geologists!
This is basically a calculator that allows you estimate the percentage of a metal in a rock, entering the proportion of different ore minerals in it.
Just select the metal and then the percentage of different minerals. After that you will see the compound % of the metal in the status bar. Keep adding minerals if you need to, and you will see the compound % changing accordingly.
Metals included:
gold, silver, copper, molybdenum, tungsten, iron, zinc, lead, nickel.
And more than 45 ore minerals!:
Chalcopyrite, bornite, chalcocite, covellite, Chalmersita, cubanite, enargite, tennantite, tetrahedrite, stannite, brochantite, Atacamite, Chrysocolla, Azurite, chalcanthite, malachite, Cuprite, Antlerita, tenorite, Argentite (Acantite), pyrargygrite, Proustite, Querargirita (cerargirita), calaverita, Silvanita, Electrum, Wulfenite, molybdenite, Scheelite, wolframite, Sphalerite, cincita, Smithsonite, anglesite, Cerussite, Crocoite, galena, pyromorphite, goethite, limonite, siderite, hematite, magnetite, garnierite, pentlandite, Millerite, Niquelita.
iOS 6+