| 1. | Traditional techniques of panning and shaft mining, however, yielded only limited output.
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| 2. | Industrial-scale quarrying began at Ghelari in 1863, followed by shaft mining from 1881.
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| 3. | One hundred shaft mines were in operation in and around Belleville.
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| 4. | In the mountains, shaft mining predominated, producing large amounts of waste.
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| 5. | Houghton Main was a deep shaft mine and Dearne Valley a drift mine.
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| 6. | There were only two shaft mines for iron ore in the Birmingham District.
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| 7. | As well as drift mines, small scale shaft mining was used.
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| 8. | No . 6 was a shaft mine, newly opened just north of the camp.
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| 9. | In 1905, Saline County had numerous small slope mines and 15 major shaft mines.
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| 10. | The first underground shaft mine was built in the region in 1874 near Scammon.
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