Turns out we are going to need Zinc per #1205, for batteries. I brainstormed a few other uses for Zinc as well, one of which includes Brass:

Planned/Potential Uses:

• Batteries (#1205)
• Zinc-Chloride - Wait on Chem Lab - Late-Game replacement for Creosote (wood treatment only, not fuel)
• Uses in Boilers maybe?
• Brass (see Below)

Planned/Potential Uses for Brass:

• Replace Gold-Plate Gear
• Use for Hobbyist's Steam Engine (if Kept)
• Alternate Recipe for Gear Bearings
• Machinery
• Pipe Fittings and Valves (Usually use a lead addition or advanced precision, but this is Minecraft, we can go a little simpler here)
• Alternate Recipe for Sturdy Casings (Forestry Integration, possibly?)
• Aesthetics - Round out the Steam Punk look with Brass Blocks, etc.