One thing so far I haven't seen mention of (keeping in mind that I am new to to these forums) is metallurgy. Did you know that if you are in the mountains and are able to identify the right minerals you can smelt minerals into ore?
Tin and lead minerals can be melted into metal with just the heaat from a campfire. Not exactly strong enough metals for a knife but the lead would be great for replenishing some ammunition in some rifles and tin would be great for arrowheads, as well as containment vessels for drinking water for example.
Copper and Iron ores can be smelted off the land, however you would need to construct a clay "kiln" in order to turn wood into coal, and then construct a clay "bloomery" (basic primitive furnace for smelting ore) in order to acheive high enough heats to melt the ore.
WARNING: A clay bloomery obviously acheives very high heats in excess of 2200C and is extremely likely to crack apart on the first use. I do not suggest trying this unless you have a wide clearing away from flammable material, and have done alot of CROSS-REFERENCING research on how to make one properly. And even then I recommend extreme caution in its use as you are dealing with molten metals which depending on what else could be mixed in with your ore, might not stay in a calm puddle either.
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