One mistake. You can't sell endlessly because trader will be anymore interested in buying it. So this is not effective. Sure it can be done but .... is so ineffective . And honestly looting is inefective too - it is more efective just doing quest and get bullets + buying bullets + brass + bullet casing. smelt coin need wood = more time spended on mining. Why wood not coal? because you need coal to make gunpowder. there is a lot random things here - how far are traders, how POI you mostly get, which POI is nearby and are restardted by quests, Air drops etc. so your suggestion is very ineffective way. About looting - this depends on your like , how POI are far from you and which type of them etc. so = copper ore would make mining more effective and doing quests less - how looting is efective is hard to say because one person can found 2000 brass in this same time and another person only 20. And there is more things to do in this same time etc.
So let say copper is added and steel parts cutted:
You have team of 2 persons - 1 is mining, cutting tree , building crafting, 2 is farming, looting doing quests ,scavenging making food ,
1. person is cutting trees for wood to makes weapons, tools, buidling, smiting itd, mining ores and doing building and take care about base while making vehicles etc
2. looting making quests in this same time
1. person making ammo , here came 2 person and give 1 a found weapons and 1 give 2 a ammo and better pickaxe etc so both of them doing things effective.
And now it how is looking now -
both of them have to mining ineffective ( perks ) , looting ineffective etc. because 1 person would be afk without brass because he can't making ammo without brining brass by 2 person. And his job is after time pointeless because 2 person will find steel pickaxe and axe faster that 1 person will get steel tools parts to make steel tools
