KBI Enriched Gravel

-Released Mod
-Contains 8 types of Enriched Gravel, of varying quality
-Will drop chunks of more valuable materials
-Appears identical to normal gravel
--2 disabled chunks, clay (removed in favor of vanilla clay balls) and redrock (couldn't get the recipe working, EBXL or BoP)
-Contains Gravel Sifter item, crafted with 6 sticks, 3 string, and has 64 uses
--Right-click on regular Gravel to convert to Flint, right-click on Enriched Gravel to get up to 3 times as many bonus drops

Caveats

All types of enriched gravel appear as "Slightly enriched" with NEI's block identification thingy, and with the Pick Block feature. Consider this an exploit prevention.