Posted: 16/12/2015 at 18:16
Hi Nora, welcome to the forum: re bought-in compost - I've encountered all the usual 'stuff': wood chippings, string, plastic strip (mostly blue!), bits of bottle glass and a tidy range of pebbles. *As a professional geologist, I can readily identify most granites, quartz and sandstones, at least to 'region of origin'. Sadly no sizeable nuggets of gold, silver or diamond-bearing ore as yet, but I live in hope!!