The cave was rather large standing about one hundred feet high and three hundred feet long. At its eastern side stood a large platform where sat the Great Goblin until his death in July of 2941. It had only two ways in or out and was located about five miles from the Front Porch and about thirty miles from Gollum's cave.
The cavern was where Great Goblin briefly interrogated Thorin and Company for trespassing and possessing Elven weapons. It was also the place where Gandalf slew the Great Goblin after he had made it clear he was going to put them all to death.