New Idria was the second most productive mercury mine in North America, producing over 38 million pounds of mercury during its lifetime. Mercury mining operations ceased in 1972, with the closure of the New Idria Quicksilver Mining Company.

“where mercury was first found in 1490 AD.”
I have to disagree... It has been running out of the hills forever all over the world. Someone just finally noticed and documented it.
“First found “ is not “it didn’t exist before it was first found”
Why is it man always tries to take credit for nature timeless?
“I Invented fire!” No you were lucky and lightening stuck close to you...