Hey welcome in the club.
I live in The Great North so I experience this problem every year, during about 5 months.
My lab is not heated so everything freeze (exept some acids)
But I recentry tried what's called the «crockpot method» and I like it a lot. It is very effecient for e-scrap like CPUs.
You pour some HCl then let it dissolve base metals during 3 days on high. What's left is gold and insoluble material. Filter then dissolve in little AR.
It's a cheap way to recover gold from CPUs. If you want, I can post some pictures.