I don't know how the process in Parliament goes, but a resolution or report expressing concern on these escalating human rights conditions would be very well taken. I'm sure it would have an impact, and people would tell the military to lay off a little if these expressions of support were to take place.
You can, if possible, also ask the Prime Minister to make representations to the Philippine government. If the Prime Minister were going to the Philippines, it would play a major part if he could express concern over this issue. The Canadian embassy in the Philippines could also look into the charges on these Canadian mining firms. An embassy is supposed to promote investment, but Canada is known for human rights, so there could be limits to that promotion. A privileged speech from a parliamentarian, if you have it here, would also make an impact. A study mission would probably be more effective in the Philippines.