"Freezing arsenic underground is a good solution, but in general it's not a permanent solution," says Dr. Ahmad Ghahreman, a Queen's University assistant professor in the department of mining. The new process, which costs about 40 per cent less than the hydrogen peroxide treatment, uses a column of activated charcoal and air to convert an arsenic trioxide solution into an arsenic five-oxide solution, leaving a deposit of "immobilized" arsenic that does not require further treatment. Dr. Ahmad Ghahreman, a Queen’s University assistant professor in the Department of Mining, has developed a new process to render arsenic trioxide into a safe form. (Submitted by Ahmad Ghahreman)"You remove that arsenic [trioxide] from underground. He said if the process would work in Yellowknife, it could take less than five years to treat all the arsenic underground at Giant Mine.

Source: CBC News November 26, 2017 12:56 UTC