Find you an active gravel quarry owner around Zapata Texas
Garage Rocker HankRocksHis quarry needs to be within a quarter mile of Lake Falcon or a 1/2 mile from the Rio for best Rio gravel deposits.
You will be safe on his property.
Pay him to have rights to sort thru his gravel piles and keep 1000-2000 pounds of gravel.
Bring like a 35 gallon barrel of water so you can fill your spray bottle to wet the gravel.
Stay at Holiday Inn Zapata.
The big quarry owner did not allow me on his property. It is just north of Zapata and right on the river where the lake begins. Closer to centerline of the river dang it.
Alternate plan:
There is a landscape supply yard in Zapata. Have him order a couple of dump truck loads of Rio's and have him deliver them to his stock yard for him to sell as plain gravel.
(If he doesn't already have a pile of them.)
With the understanding that you get to sort thru them at a fair price completely before he can sell them.
The landscape yard I stopped at had a real big pile of Rio's already piled in his stock yard. I asked to pick thru the surface of the pile.
He did no want to charge me for 2 - 5 gallon buckets, of course I insisted. Pretty sure he would have let me pick thru the whole pile for $200. A week's task.
He had loaders to re-stack the pile on site, no problem.
The larger sizes(3 to 6 inches) - #1-#2-#3, have the best agates and woods.
Or find out from the McDonalds where they ordered their gravel for their large gravel islands. It was super rich in fine rock.
The best mined gravel has been scrubbed or washed somehow to remove that nasty caliche for easier ID.
The I visited the 1st and 2nd time there was about 2 large gravel trucks per hour loaded with scrubbed gravel.
The pit was located 200 yards from Lake Falcon. They let me collect in the quarry the 2nd trip.
DOT was widening the main highway thru Zapata, so all the gravel pits were operating at full capacity.
I only spent a couple of my last days in the quarry. Shame I did not spend the entire two weeks collecting there. Hindsight. It was the goldmine.