sentences:  The deposits are bedded manto-type deposits in Paleozoic limestone.The mines, promoted by Whitaker Wright, produced well for a few years after miners tunneled into a silver-lined cavity they named the “bridal chamber” that alone yielded 2.5 million troy ounces (78 metric tons) of silver.But no more bridal chambers were discovered, the mines struggled and were worked periodically into the 20th century.