Is there still geomantic omen in a secluded house when quarrying mountains? Can you still bury the old man at the foot of mining stones?

I don't know the specific situation, but from what you described, it is not suitable for Tibetan ancestors. From the perspective of geomantic omen, the vein was cut off during excavation, and the collapsed mountain could not be used by Tibetans. You'd better find someone to check it out on the spot. Feng shui is related to future generations and should not be careless.