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== HiddenOre ==
Ores have a random chance of spawning adjacent to (or replacing) blocks which a player mines ([https://github.com/CivClassic/HiddenOre HiddenOre]). If the block is stone or terracotta the ore will be an overworld ore{{Clarify}}. If the block is Netherrack the ore will be a Nether ore{{Citation needed}}. The chance of an ore block spawning is based upon: <code>number of faces revealed by breaking a block + block itself</code>. Ore spawn chances are dependent on y-level, with probabilities roughly corresponding to vanilla.
=== General mining strategies ===
Ore spawning decreases after many blocks in a chunk have been mined.
* Mining blocks which cannot generate ores (such as gravel) will thus decrease ore spawn chances{{Clarify}}. This also applies to placing blocks such as torches.
* Attempts to abuse HiddenOre, such as mining and replacing the same block multiple times will likely also decrease ore spawn chances.
=== Emeralds ===
Emerald Ore is not spawned via HiddenOre. It can be found only in the <code>Extreme Hills +</code> biome in bunches of 1 to 10 ore blocks, making it considerably rare (whereas in vanilla they only spawn as single blocks and also in "normal" <code>Extreme Hills</code>).
=== Diamond mining ===
Diamonds spawn at the vanilla height, below layer Y=17. Unlike all other ores, diamonds will spawn in HiddenOre veins. Finding a diamond thus indicates a cluster of nearby diamonds. Veins are randomly generated using a Perlin noise. The vein itself is a disc rotated in 3d space. The diamond density in a vein is higher near the center. A message will be displayed every time a diamond ore spawns.
==== Strategies ====
Mining a long tunnel is a good way to find veins. If a player already possess resources, one of fastest ways to mine is using a haste II beacon and efficiency V silk touch pickaxes. Cheaper diamond mining methods include [https://www.reddit.com/r/CivEx/comments/ai651b/how_to_mine_good_by_w_the_juice_juice/ wjkroeker's method], one of the most space efficient. If a player has a minimap mod, it can be useful to waypoint or otherwise mark diamonds to discern the shape and center of the vein.
=== Fossils ===
Mining stone blocks has a random chance to drop a fossil. Fossils are a lored Prismarine Shard. They can be cracked by using the "Ore Smelter" factory for random, albeit unlikely, treasure.
{| class="wikitable "
|+Fossils drop
!Drop
!Probability (%)
!Amount
|-
|Dirt!
|89.4945318
|1
|-
|Player Skull (any)
|9.11764684
|1
|-
|Spawn egg {{efn|any of the following: Vindicator, Vex, Silverfish, Endermite, Zombie Horse, Skeleton Horse, Donkey, Polar Bear, Parrot, Llamma, Wolf, Squid, Ocelot, Rabbit, Horse, Mooshroom.|group=note}}
|0.470588224
|1
|-
|City bastion
|0.037037
|1
|-
|Jukebox
|0.029411764
|1
|-
|Prismarine crystals
|0.029411788
|3
|-
|Prismarine shards
|0.029411764
|5
|-
|Bucket
|0.029411764
|1
|-
|Iron horse armor
|0.029411764
|1
|-
|Minecart
|0.062352939
|1
|-
|Disk (any)
|0.035294119
|1
|-
|Lapis/Iron/Redstone Block (any)
|0.088235292
|1
|-
|Emerald/Diamond (any)
|0.058823528
|1
|-
|Noteblock
|0.029411764
|5
|-
|Iron pickaxe
|0.29411764
|1
|-
|Iron spade/sword/axe (any)
|0.088235292
|1
|-
|Beacon
|0.0037037
|1
|-
|Charcoal
|0.0037037
|2048
|-
|Spawn eggs {{efn|any of the following: Zombie Pigman, Enderman, Cave Spider, Villager, Witch, Slime, Magma Cube, Guardian, Ghast, Blaze, Spider, Skeleton, Zombie, Creeper|group=note}}
|0.0518518
|1
|-
|Diamond block
|0.0037037
|1
|-
|Iron ingots
|0.0037037
|64
|-
|Piece of diamond armor (any)
|0.0148148
|1
|-
|Diamond axe/pickaxe/shovel
|0.0111111
|1
|-
|Bastion
|0.0037037
|1
|-
|Diamond horse armor
|0.0037038
|1
|-
|Silk Touch book
|0.00110909
|1
|-
|Enchanted Books {{efn|any of the following: Power V, Infinity, Efficiency V, Unbreaking III, Sharpness V, Protection IV|group=note}}
|0.00725454
|1
|-
|Imcando Pick {{efn|Lored diamond pickaxe with Efficiency V and Unbreaking III |group=note}}
|0.00040909
|1
|-
|Apollo's Bow {{efn|Lored bow with Power V, Unbreaking III, Flame I and Infinity|group=note}}
|0.00040909
|1
|-
|Clockback {{efn|Lored watch with Knockback III|group=note}}
|0.00040909
|1
|-
|Gezo {{efn|Lored paper|group=note}}
|0.00040909
|1
|-
|Egg of Creation {{efn|Lored dragon egg|group=note}}
|0.00000001
|1
|}
{{notelist|group=note}}
See [[HiddenOre]].
== ItemExchange ==
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