Sand / Quarz relative abundancy

I suggest to check again the recipes using sand and the way to produce sand and the
availability at the start of the game. In many maps there are plenty of coal/copper/iron ore (3-4 each). and quartz ( only 1-2 caves )
The only use of quartz is to make sand once the "sand" by the see is depleted
I have many games saves wih maps where the first iron/copper cave is still there. Limestone is always poorly used and the first mine is still there afte 5000+ years. Coal becomes nearly unused at late game. In all end game i'm near to completely finish all available sources of quartz ( so sand ) and i'm forced to build a trade ship to exchange it.