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Some design considerations for working in one-third of Earth's gravity, is carrying enough mass to ballast the torque of the rotary cutting head, which may impose limits on the depth of cut....depending on the ground's hardness. Carrying more fuel onboard would be one option.
An example of how large-scale surface-mining is efficiently handled as a matter of course, can be found in Australia, where clear lessons can be learnt about this economic, low-risk, minimum infrastructure process:
Iron Ore mining in Australia
SURFACE CUTTERS
CUTTING DEPTHS

ADVANTAGES
APPLICATIONS
DIESEL ENGINE
GENERATOR
GAS TURBINE
MULTIFUEL TURBINE
RELIABILITY
METHANE DIESELS

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