This cache is hidden at a mine adit in the Mount Uniacke Gold District.
From highway 101, take Exit 3 towards Mount Uniacke. Head west on Highway 1 until you get to Uniacke Mines Rd. Park at the end of the road (coordinates provided) and hike the ATV path for approximately 1.5km.
Although the adit is only about 15ft long, it's still quite something to see. On the way in the trail, if you pay close attention, you will also come across some old ruins, and what looks to be a old homestead area.