The heat weakened or fractured the rock on account of thermal growth or other processes, dependant upon the variety of rock and ore. Crude ventilation and pumping methods were used wherever needed. Hoisting up shafts and inclines was carried out that has a windlass; haulage was in “vehicles” and wheelbarrows. https://safe-haven-assets51604.full-design.com/top-latest-five-exchange-traded-funds-etfs-urban-news-78667762