For the life of me I can't find silver ore. Been through several caves/chasms mine in the elevations mentioned, tons of iron (and manganese since it is pretty dense and large clusters in tundra), a workable amount of copper, tin, and lead, but absolutely 0 silver. At this point I'm wondering if something is bugged or if the texturepack I'm using (PureDB + Blightfall patch) retextured them in a way that is making me ignore them. I skip salt since I have plenty and no need for it, but maybe some of those things I thought were salt was actually silver... (But I looked at the textures in NEI and they seem to look like other ores, not salt.)
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I like how the regions are very well differentiated. Minecraft's basic worldgen, even with biome mods, is total chaos (understandably, really) that things just become samey, especially underground. I feel it could benefit from a more focused/controlled world gen - not necessarily handcrafted like Blightfall, but purposely limited in size (instead of simply bound by the limitation of how big a number the program can use) with regions defined in relation to each other. Terraria springs to mind. Hopefully this would also allow such regions to plug together in ways that make a bit more sense, not transitioning from desert to swamp to extreme hills within a chunk of each other. Unlimited resources could still be achieved through vanilla multi-dimension options if they care to implement it (it would be a simple matter of having a nether or end portal-like for vanilla players to craft that goes to a replica overworld dimension), though I mean for this limited world to still have more than enough resources for players not looking to mod.
(It occurs to me this might be reasonably easily possible even in Minecraft's default 'unlimited size' world. At the top you'd start with 'tiles' of continents, which are separated by oceans. Each continent is then mapped into regions, with all regions appearing in each continent but by no means in the same general location or shape. Archipelagos, lonely mountains, mountain chains, forests, plains, savanah, desert, badlands, rivers draining from mountains into bays and swamps, placement of biomes determined by rainfall patterns [themselves determined by prevailing winds and windbreaks, which may vary per continent region]. Placement of tundra/taiga would be placed in only one cardinal direction and will vary compared to other continents, which won't quite make sense, but at the least each continent itself can be coordinated internally.)