Deep Pit

Deep Pit is a end-game mining zone requiring both combat and mining levels.

It is the only mining source for stygian ore.

While mining in Deep Pit, there is a chance of encountering a Greater Demon, making it a dangerous mining zone.

Drop Frequency

Name	Level	Experience	Gold Value	Copper	Tin	Iron	Gold	Mithril	Addy	Runite	Clay	Stone	Sand	Silver	Coal	Slate	Stygian	Salt
Deep Pit	70	10-150	15-500				25			50						25	10

Note that these numbers represent a frequency, that's why they sometimes add up to more than 100 in total.
To get percentage values you need to do (frequency / totalFrequency) * 100, i.e. Clay in Desert: (3 / 106) * 100 = 2.83%

Average drop per hour

	Copper	Tin	Iron	Gold	Mithril	Addy	Runite	Clay	Stone	Sand	Silver	Coal	Slate	Stygian	Salt
Deep Pit				40.91			81.82						40.91	16.36