Source: https://www.reddit.com/r/feedthebeast/comments/46s645/immersive_engineering_vein_calculator/ from /u/xavion - repl.it was down this is a copy from the Google cache

ftb_orevein_finder.py

# Python port of https://gist.github.com/ApocDev/7d43dfccd00269670de7

class JavaRandom():
	def __init__(self, seed):
		self.seed = (seed ^ 0x5DEECE66D) & ((1<<48) - 1)
	def NextInt(self):
		return self.Next(32)
	def NextDouble(self):
		return ((self.Next(26) << 27) + self.Next(27))/(1<<53)
	def Next(self, bits):
		self.seed = (self.seed * 0x5DEECE66D + 0xB) & ((1<<48) - 1)
		return self.seed >> (48 - bits)

PosX = 0
PosZ = 0
ChunkRadius = 10
SEED = 1
IncludePlatinum = False
VeinToFind = "Uranium"
VeinChance = {}

def getRandomMineral(x, z):
    seed = 940610
    RNG = JavaRandom(SEED + x * x * 4987142 + x * 5947611 + z * z * 4392871 + z * 389711 ^ seed)
    dd = RNG.NextDouble()
    if dd > 0.125:
        return None
    else:
        query = RNG.NextInt()
        weight = abs(query % sum(VeinChance.values()))
        for v in VeinChance:
            weight -= VeinChance[v]
            if weight < 0:
                return v
    return None

def getInt(prompt = ""):
    num = input(prompt)
    while not isinstance(num, int):
        try:
           num = int(num)
        except ValueError:
            num = input("Please enter an integer")
    return num
    
def getBool(prompt = ""):
    ans = input(prompt + "Y/N")
    while not isinstance(ans, bool):
        if ans.lower() in ["n", "no"]:
            ans = False
        elif ans.lower() in ["y", "yes"]:
            ans = True
        else:
            ans = input("Please enter Yes/No")
    return ans

def setup():
    global SEED, IncludePlatinum, PosX, PosZ, ChunkRadius, VeinToFind
    SEED = getInt("What is your seed? ")
    IncludePlatinum = getBool("Does platinum spawn? (No in Infinity)")
    PosX = getInt("What is your X position? ")
    PosZ = getInt("What is your Z position? ")
    ChunkRadius = getInt("How many chunks away do you want to search? Suggested values < 24 ")
    
    veins = ["iron", "magnetite", "pyrite", "bauxite", "copper", "cassiterite", "gold", "nickel", "uranium", "quartzite", "galena", "lead", "silver", "lapis", "coal", "any", "all"]
    VeinToFind = input("What vein are you looking for? ")
    while not (VeinToFind.lower() in veins or (IncludePlatinum and VeinToFind.lower() == "platinum")):
        VeinToFind = input("Please enter a valid vein (or any/all)")

def main():
    VeinChance["Iron"] = 25
    VeinChance["Magnetite"] = 25
    VeinChance["Pyrite"] = 20
    VeinChance["Bauxite"] = 20
    VeinChance["Copper"] = 30
    VeinChance["Cassiterite"] = 15
    VeinChance["Gold"] = 20
    VeinChance["Nickel"] = 20
    if IncludePlatinum:
        VeinChance["Platinum"] = 5
    VeinChance["Uranium"] = 10
    VeinChance["Quartzite"] = 5
    VeinChance["Galena"] = 15
    VeinChance["Lead"] = 10
    VeinChance["Silver"] = 10
    VeinChance["Lapis"] = 10
    VeinChance["Coal"] = 25
    
    chunkX = PosX >> 4
    chunkZ = PosZ >> 4
    for x in range(-ChunkRadius, ChunkRadius):
        for z in range(-ChunkRadius, ChunkRadius):
            mineral = getRandomMineral(chunkX + x, chunkZ + z)
            if mineral != None and (VeinToFind.lower() in ["any", "all"] or mineral.lower() == VeinToFind.lower()):
                print("Chunk {0}, {1} has {2}".format(((chunkX + x) << 4), ((chunkZ + z) << 4), mineral))

setup()                
main()