Silk Touch isn't exactly a rare enchantment, but it's far between enough that I'd rather not waste a silk pick in an experiment; I'm hoping someone else has tried this (with success).
The main crafting ingredient in a BuildCraft quarry is an undamaged diamond pickaxe. I was able to use one that had the Silk Touch enchantment. Now, before I go committing to unleashing this on a 64x64 area, will the quarry give me ores instead of ingots? To be clear, I was able to craft it using the enchanted pick.
I can deconstruct the quarry if this isn't going to work using a deconstruction table; I would be awful sore if I ended up losing a brand new silk touch pick for nothing :)