Indian Raid on the "Spanish mines" - March 4, 1867.

Reverse overshot water-wheels were used to lift water, and sequences of such wheels have been found in the Spanish mines.

There are many parallels from Spanish mines of the Roman period with similar stone anvils.

Through the Encomienda system the Indians were forced to work in Spanish mines.

In the early nineteenth century, there was a Spanish mine nicknamed "Old Bat Hole" that was abandoned due to Indian raids.

The Russians had settled Alaska and were exploring the West Coast for trading posts within striking distance of the rich Spanish mines.

Germany and Nationalist Spain settled the issue of German interests in Spanish mines.

During Central America's colonial period, indigenous Indians were indentured to work in the Spanish mines.

In December 1796, Austin and a companion traveled to investigate the Spanish mines.

What actually caused the Maine to explode - a Spanish mine or an accident in the ship's forward ammunition magazine - is still a mystery.