Tinkers' Construct adds several new ores to the Minecraft world generation:

It also adds Gravel Ore generation for Aluminum, Copper, Tin, Iron and Gold.

(Any Material not listed here would either be an Alloy or part of a different mod.)

Ore Gen

Ore Generation

Other World Generation

Tinkers' Construct also adds other world generation; specifically, the generation of ore bushes. Six bushes generate in the Overworld:

These Bushes can be reharvested after you break them. They can be replanted in areas where light levels are lower than 13. Similar to cactus, they damage the player if they are touched.

The ore berries they produce can be smelted into the respective ore's nugget.