The land in this area is composed of granitic and volcanic rocks. The latter form the highest ground, while the granitic rocks, which weather relatively easily, form the lower areas in the southern parts of the park. To the east of the park is a rich deposit of wolfram which was first mined in 1936. Mining was interrupted during World War II. With the high post-war prices, mining was resumed in 1951 and continued until 1968 when the prices again fell drastically. The highest average monthly output in the latter period was 30 tonnes, and was entirely for export. There are several abandoned lead mine workings around Lead Mine Pass, some of which date back several centuries.
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