Well even that would vary widely. Some places it's easier to extract iron ore than others, or you could just melt down a meteorite and use that iron/steel to mine more ore.

Drilling also isn't necessarily so hard. Neolithic Chinese built perfectly circular discs out of jade, an extremely hard stone. They had no metal tools. It's possible that they could have developed more sophisticated equipment for mining rock, if they realized what they could do with it once they extracted it. https://www.ancient-origins.net/unexplained-phenomena/myster...