Where the shape comes from
Nuggets in the ground under a cover: the two short strokes inside are the lumps of ore, 土 below them the earth they lie in, and the pointed top the roof of the shaft. It marks metals and metal objects — 钱, 银, 钟, 针 — written 钅 on the left of a simplified character.
汉字 filed under 金
No published character on HSK Guide is filed under this radical yet. 汉字库.