| 1. | An opencast mine was also located on the mountainside above the village.
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| 2. | In 1926 the opencast mine was closed due to exhaustion of the ore.
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| 3. | They followed the ore veins underground once opencast mining was no longer feasible.
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| 4. | They switched production technique to opencast mining, and made large profits.
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| 5. | The East Merthyr Reclamation Scheme is a euphemism for opencast mining.
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| 6. | The northern portal of the tunnel has been buried by opencast mining activity.
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| 7. | In the 1960s opencast mining took over the surrounding countryside.
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| 8. | To increase wartime coal production, the government introduced opencast mining all over the country.
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| 9. | The installation was carried out between 1988 and 1991 in the Klettwitz-Nord opencast mine.
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| 10. | Opencast mining took place in 1975 removing all evidence of the former mining industry.
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