Silverlight Straight

Sitting approximately 280ft deep and it's seams estimated to be stretching over 70 miles long, the silverlight straight is a rich deposit of Silver Ore inside the Whitethorn Mine, located beneath Thornbul Village. While it's mainly silver, an as-yet unidentified mineral-like rock was discovered 4 miles in that, due to its incredibly durable and strange properties, had made accessing the silver progressively harder and harder. Only a small fraction of it has been accessed prior to the Silverlight Mine Disaster;  and it's tunnel is now sealed with rocks and corpses.