I would consider plunging & falling, by far and away, the most likely cause of death or injury to any explorer of old mine workings.
Vertical drops of alarming height abound everywhere in practically every mines. Make sure that there is adequate lighting at all times. It is far better to check things out twice, than to be sorry with going where it’s not clear of what dangers might lurk there.
Like all dangers, the possibilities of falling represent the greatest risk to the unwary and inexperienced; as such individuals often take reckless chances because they have not experienced enough. Usually, it is simply that they are aware when a risk of falling is present.
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Now get out thar a git dem thar Nuggets!!!!!!!!!!!!!!