Fnkee's Solid Rocks replaces stone with layers of sturdy rock, calling for explosives to be utilized. A challenging take on vanilla's mining, in the making.
Based on your feedback, I hope we can steadily make this a mod that grows more challenging and fun over time.

[ This mod will replace stone and ores in your world. Use at own risk! ]

v0.1.0:
‣ All Stone is replaced by four layers of tougher stone, making mining increasingly more challenging
‣ Ore is replaced with tougher ore, based on which layer it is found in
‣ Dynamite and Charged Dynamite has been added (right click to activate/deactivate)
‣ Cobblestone and Dirt can no longer be obtained by vanilla means
‣ Diorite, Andesite and Granite is removed for now (but will be added back in later on)
‣ Coal Ore doesn't spawn at the bottom layer
‣ Gunpowder drop is guaranteed
‣ Stone, Ores and Dirt are set to drop items on explosion

Known issues:
‣ Chain explosions - Dynamite won't return correct state and sometimes drop instead of explode
‣ Emerald hasn't been implemented and retains in its original form (drop on explosion is not guaranteed)

Dynamite

Bone Meal + Gunpowder + Sugar Cane

Charged Dynamite

Dynamite + Redstone Dust

Cobblestone

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Dirt

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Fnkee's Solid Rocks [Archived]