"PLUMBAGO" is an old word for the lead ores like GALENA. - Believe it or not, there is lead naturally in the earth of New Zealand and it was successfully mined in past times - particularly at the TUI Mine in Te Aroha .. an interesting NZ geological report linked below:
TUI Mine Entrance ..
https://www.nzpam.govt.nz/assets/Uploads/doing-business/mineral-potential/zinc.pdf
Galena is a heavy Lead-Sulfide Ore
"Plumbago" is also the name for blue flowered plants that are said to grow in lead containing soils .. and a species of butterly.
White Island (Whakaari) Bay of Plenty
SULFUR .. some 11,000 tonnes of sulphur were mined historically on White Island (Whakaari) - an active volcano that has taken lives several times, most recently in 2019.
Brimstone - SULFUR found at Hot Springs & Volcanic Vents.
Lead, Zinc, and Silver, GOLD & Copper tend to be found together - and like Sulfur, are generally Volcanogenic - and NZ has a fair amount of volcanic activity around our islands eh. - Silver was commercially mined back in 1897 at TARAWERA, Preservation Inlet, Southland.
Silver Bullets - 10% lighter but harder than lead would have been fairly common (or lead-silver alloy) back in the good old days, as silver was sometimes regarded as a nuisence by gold miners - but then they'd have needed ammo for their firearms .. especially if there were vampires sniffing around.
- If you are interested in Saltpeter, Potasium Nitrate .. well you can brew your own by collecting bat shit from caves or by storing urine-rich excrements in heaps kept moist until it magically appears by efflorescence .. this would work better up around Auckland where they have more shit and rain eh.
Mangare Sewage Works, Auckland:
It can be a bit dry Down South.
If you're curious about where you might find some STEEL down here .. No Problem as NZ STEEL in Waikato are busy sucking-up IRONSANDS and smelting it and churning out COLORSTEEL®. and other stuff.
Our Iron Sand (57% iron) is from the West Coast of the North Island - deposited by VOLCANIC activity from the TARANAKI region 2.5 Million years ago.
A lot of ironsand ore is exported by pumping it as a slurry to an off-shore terminal for shipping
Someone is making money .. Sucking It Up - piped 3 km off-shore Taharoa at the 185 tonne Mooring pipe Terminal Buoy.
I guess that what I am saying is that were we to be totally isolated down here in the South Pacific .. we might still be able to make traditional guns and other tools from local resources - including wood for charcoal and for stocks. - Just a thought anyway ..