Either of the two, both of them has a negative impact on the environment. Mining gold can affect the loss of biodiversity, erosion, and it's just destroying the land. Addition to that are the limited gold. In mining bitcoin, it consumes a lot of energy and create tons of co2 that is obviously bad for the environment. But think objectively, when you mine gold, there are laws regulated by the government regarding it. It's much harder compare to mining bitcoin. There are already a lot of problems in mining because of illegal mining, and it's basically destroying the environment big time. Will you still add to that?
More or less so, in my country there are many mines, especially coal mining. Coal is not much different from gold, where the land must be dredged deep to get what is sought. In fact, I compared the conditions before the existence of gold mining or other mining conditions when the mining had been built, enough to make me sad to see it. Nature that was once green, is now arid and has large holes filled with project trucks that carry mining products.
Mining does not always operate, when the search is started, the mining will be closed. And stupidly, the big holes they dredged up were not closed again which eventually became quite dangerous puddles.
Here I start thinking, why does everyone criticize bitcoin miners, even though bitcoin mining in my opinion is more appreciative of nature. There is no natural damage, I'm sure if the problem is about electricity, in the future there will be new innovations in electricity efficiency. Mining bitcoin is also universal, where everyone can mine without regulation, without the word illegal. I hope that in the future people can realize this and start mining bitcoin.