As you start hiking up the mountain, you follow the old quarry road and in fact, most of the hike is along that old road.
A little ways in -- maybe 1/4 of a mile?? -- you'll see a sign indicating the Slate Spring Trail, on the left and heading up the mountainside. To the right, the Hone Quarry Falls Trail continues as you cross a small stream.
As we descended back down the old quarry road, we stood to the side of the road and watched in envy as a rugged jeep passed us -- not a road we'd try with our Rav4. Yeah, that. Jeep envy. It's a thing.
hike up the mountain -- just over 500 feet in 2.5 miles.
Getting there: Follow Hone Quarry Road all the way until the end -- there's a parking lot.