mining Venus is technologically easy and the solution is obvious. The issue with the surface probes was the electronics, so dont use electronics on the surface. Use gears or fluid based computers which can handle far higher temperatures and pressures then semiconductors. Have buoyant wind turbines tethered.The "wind turbines" would be closer to hydro turbines since the surface is a supercritical fluid. The turbines dont produce electricity, instead they use pulleys or pneumatics to get stuff done. The mostly autonomous and incredibly simple robot floats back up using a mix of buoyancy and aerofoils. It only goes up part way before transferring load to a refiner taking advantage of more tolerable temperature but still quite high pressure. the robot sinks back down and continues digging. the refiner floats up to another stage or the final destination depending on what exactly is being refined. the final destination is cloud cities or perhaps an orbital ring. Mining Venus is technologically easy, it is economically sustainable, but politically difficult.
