Run the Dungeon of the midnight grove up to the first boss via the hyena, then double back trough the wolf\boar route. Then turn back around and Hyena has fully respawned. You can stay there looping as long as you want. It’s a great place the level thralls too.
Go in with an encumbrance spec and after a few hours you’ll need a week for multiple tanneries to clear the backlog. In 1 hour I can collect enough tar to keep a plant based tannery going for 2 days (no thrall). (Obsidian tools, no oils)
When traveling to the giants cave I take mulled brew. It takes a bit of effort to make, but has no side effects.
Clearing the Silvermines of all stone gives me 600 jars(plus coal, iron, etc) in less that 1 hours work. Obsidian tools only. (This includes the lower level)
On siptah SW island there is a little lake in the middle, just NE of the city. Today I cleared 1800 gold ore in one trip from that single area. Obsidian tools only. no oils. To freight that back to EL, convert it to coins for 1000 dust in 10unit of weight. Ichor and silver are easy to find in EL.