I can answer some of these:
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I found all six veins in the two mines, but I can't seem to engage Mantid in conversation. I can meet him, but nothing is ever said minus the occasional "get behind me, little one," or whatever he says. Am I supposed to wait until the end of the four cycles and let him approach me?
Don't worry about it. You don't need to speak to him. The task is complete anyway.
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Where is the trap in Uta's garden (I think it's Uta, the one that sits on the boat)?
Someone correct me if I'm wrong, but I don't think there's a trap there (in Heathen). Also, it's a reservation - not a garden. I don't think reservations have traps.
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Can you restore trees before they need to regrow (while they are giving out minimal color)?
No. Sorry
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In Una's mine chamber I see a heart on a ledge high up, but when I try climbing the wall it puts me back in the void. Does this mean there is a glyph I need to get it (trying to find the web so I can beat the whatever monster (starts with a P)?
Yes, you'll need the Magnet glyph. It's in a chamber not too far away...
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Unrelated: I've been interested in playing Pathologic for awhile now, but I've heard the English translation isn't very good. Is there an official re-translation, or even an unofficial one?
No. There's a massive amount of text in the game, which makes re-translation a huge task, and is why it hasn't happened yet. But if you're patient and willing to read everything carefully, I don't think you'll have too much trouble. The translation is poor, but understandable (apart from a few lines here and there

) and the game is definitely worth the effort, IMO
