These coordinates lead us to private property, a driveway to a couple of houses. Maybe there was something a little further, but it was all blocked off. We had to turn around and camp elsewhere.
One of the few places near Bend that was actually open for disperse camping in the winter. We stayed in a nice sight just across from the quarry, right by the turn around area. It was great for tent camping. Just beware that this is higher elevation and colder than Bend. We were unexpectedly snowed on in March! Also beware that some people use the quarry as a shooting range in the mornings, about 8am (safe distance away), but it's a good alarm if you're not already awake!
Gate is still closed. Maybe for winter? We ended up going down to the dispersed Rock Quarry, by Sunriver, which is much higher in elevation and colder than this place.