Ore issue

[tosha]

I'm working on a mod, and I made a file called ores.lua to put the code in. the code is as follows, yet 5 or more worlds have generated no ore.

minetest.register_ore({
ore_type = "scatter",
ore = "toshamod:thorium_ore",
wherein = "default:stone",
clust_scarcity = 8*8*8,
clust_num_ores = 7,
clust_size = 3,
height_min = -31000,
height_max = -64,
noise_params = {
offset = 0,
scale = 3,
spread = {x=200, y=200, z=200},
seed = 5390,
octaves = 4,
persist = 0.5,
flags = "eased",
},
noise_threshhold = 1.6
})