How easy is it to mine water on Ceres?
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Ceres' density (2.08 g/cc) suggests it has abundant water/ice below its presumably mostly dry surface. That and the shiny spot (salts left after subsurface water has sublimated) suggests it wouldn't too difficult. Low gravity, keep the dig in shade to prevent the ice from sublimating in direct sunlight. 

We could not do it now, but with improved technology and continued space exploration, it should be very possible. Ceres should be a comparatively easy place to build a space elevator too. It seems a pretty good mining option. Only potential issue might be the occasional asteroid impact.

Ask the asteroid mining companies "Planetary Resources" and "Deep Space Industries". Actual and serious companies. See the websites www.planetaryresources.com and www.deepspaceindustries.com