I had my crappy old point and shoot with me today so ignore the graininess of this close up.
I came across the balloons while heading to the second portion of the Picacho de Calera Earthcache this morning with KennyV.
There used to be two little peaks here (There is a road nearby called Twin Peaks) all that is left of the one is the dirt you see there. They are still chipping away at it (I think it is a pit now), but its twin will remain. It doesn't have the right materials for cement making.
The final stage is at the main entrance to the plant which you can see below at a distance.
We also spent a little time this morning at Saguaro National Park (west). We grabbed a benchmark that was also a virtual.
Most of our little walk to the cache was through a wash, but we did catch a little bit of the trail.
To learn more about geocaching watch this video!