"The environment inside the mines was harsh. Copper deposits usually lie deeper than gold deposits, and copper ore oxidizes on contact with air, producing heat. Thus the average temperature in gold mines was around 18oC, but could be over 40oC in copper mines. The changes in temperature when moving about in the mine were like a sauna.
「礦坑內的環境本就惡劣，又因為礦體的位置和化學反應導致不同溫度，通常位於前端的金坑，平均溫度為攝氏 18 度，但愈往裡面深挖，銅的比例就愈高，而銅坑溫度更高達攝氏 40 度以上；有時挖到兩者相連的金銅礦，一寒一熱的溫差就像在洗三溫暖。