Craigmont Corundum Mine Field Guide
2nd Hardest Mineral Corundum was Mined Here History In the late 1800s, corundum was discovered near Combermere and soon after the Craigmont Corundum Mine was established eventually becoming the largest corundum mine in the world. Corundum is second only to diamonds in hardness so it is much desired in industry to cut and polish metal….
