uberHardCraft

Flint Age

Flint plates are the key to flint tools, they are crafted like so:

Once crafted, place the plate on the ground and smash it with a rock. Rocks can be obtained by breaking dirt while hold a sift. Smashing the plate yeilds a tool head which can be crafted with a bark fiber and stick to create a flint tool. Bark fiber and sticks can be obtained by breaking trees without an axe.

• Pro tip, the sift can be used to increase you flint rates as well!

Kiln [Multiblock]

Building a kiln is now required to progress to copper tools.
A diagram for a kiln can be seen in the gallery:

The center of the kiln is the kiln fire, which can be crafted like so:

To begin construction, place the fire in the center of a 3 by 3 base of any log. Next, you must build a vertical superstucture to completley contain the kiln fire from the outside. Valid blocks for the structure are: Kiln Block, Kiln Hatch, Kiln Vent.
The Kiln Rack is placed on the inside of the structure, and is permitted but not required.
Here are the recipes for the Kiln Blockset:

Finally, ensure that there is a path of Kiln Vents that leads from the kiln fire to an air block. Now you can light your kiln fire using the firestarter item.
To actually smelt copper using the Kiln, you must craft a crucible like so:

Once crafted, place the clay crucible inside of the Kiln and ensure that the kiln fire is ingnited. Now, wait until at least 4 of the logs on base have been converted to coal blocks. After that, the clay crucible should be fired. Now you can deposit your raw copper inside of the crucible and close the kiln again. Wait until at least 6 of the logs on the base have been converted to coal blocks and open the kiln again, the copper should be melted. Now the most important step is to use tongs to pick up the crucible and pour it into a mold. A blank mold can be crafted with two clay balls and one sand, and can be imprinted with a tool head to make a mold of that variety.

Other Recipes:

Wooden tongs, firestarter, and sift: