Ease of mining:Gold mining, "Development mining is composed of...

Ease of mining:

Gold mining,
"Development mining is composed of excavation almost entirely in (non-valuable) waste rock in order to gain access to the orebody. There are six steps in development mining: remove previously blasted material (muck out round), Scaling (removing any unstable slabs of rock hanging from the roof and sidewalls to protect workers and equipment from damage), support excavation, drill rock face, load explosives, and blast explosives."
Ore needs to be hauled to surface, dewatering of site, ventilation etc etc etc............

Keysbrook,
Simple mining- sand deposit with no overburden, low rock and clay content.
eg. sand is scooped up with front end loader and dumped into hopper.