Slatechuck Mountain, known as Kaagan in the Haida language, is a summit on south-central Graham Island in Haida Gwaii, formerly known as the Queen Charlotte Islands of the North Coast of British Columbia, Canada.

It is located about 9 km west of Daajing Giids (formerly Queen Charlotte City), on Skidegate Inlet, and just south of Yakoun Lake, the island's largest lake, which is the source of the northward-flowing Yakoun River.

Known also as "black slate", this form of argillite occurs nowhere else in the world and only Haida have the right to quarry it.

The black argillite occurs only at certain locations on the mountain's slope, above the basin of Slatechuck Creek.

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