Custom Ore Generation

Vanilla Minecraft sprinkles ores generously throughout their associated depths pretty evenly. This means that you can always find an ore simply by digging down to the appropriate depth and just start digging... or even straight-up strip-mining in order to collect all the ores.

Survival Industry has done away with this, using the Custom Ore Generation mod. Ores now spawn in one of two ways:
 * Metal ores spawn in enormous motherlodes, holding several stacks of ore each, with thin, long veins snaking out underground for miles. Prospecting for these ores will require scouting for the appropriate ore flower, and then the necessary work to dig around to find the vein.  Once the vein is found, the player can follow the vein back to its source.  Note that veins can have breaks, which means that when it stops, you will need to dig around to find out where the vein picks back up.
 * Non-metal ores spawn in sparse clouds; these ores are basically spread out in gigantic areas, so that there is a wealth of ore available when you find it, but you will need to dig a lot to get the ore. There are no veins for these kinds of ores, and the ores get more spread out the further they get from the cloud itself.