3. Patricia Panganiban, Ryan Santiago, and Kristina Yatco proudly present The Disappearing Copper Cauldrons DISCLAIMER: This story is, in fact, not about copper but about gold. Glittering gold.

4. LONG, LONG AGO in a magical school not found in Scotland where students rode not on magical broomsticks but on NASA-certified rocket ships were three pretty okay, not so bad students...

6. GOLD Dense, soft, shiny, malleable, and ductile One of the lease reactive chemical elements under solid conditions Occurs in free elemental form as nuggets or grains in rocks World Consumption of Gold: 50% jewelry 40% in investments 10% industry

7. GOLD INDUSTRY IN THE PHILIPPINES Gold deposits occur in 73 provinces in the Philippines Principal producing districts: Baguio, Masbate, Surigao, and Masara Gold Production: 31,120 KGS (2011) (Est Value: PhP 63M) Price: Php 2,147.99 per gram

9. Silver Soft, white, lustrous, ductile, malleable (slightly higher than gold) Highest conductivity of any element and highest thermal conductivity of any metal Occurs in free elemental form, as an alloy with gold or other metals, and in minerals such as argentite and chloragyrite.

10. Silver Uses: jewelry, tableware, utensils, currency, conductors, mirrors, photographic films (compounds) Silver Production: 45,530 KGS (2011) (Est Value: PhP 2M) Price: Php 45.16 per gram

15. UNDERGROUND MINING OPEN-PIT MINING

16. JAW CRUSHER CONE CRUSHER BALL MILL

19. ROASTING / METAL OXIDE SMELTING 2 AgS(s) + 3 O 2 (g) + (heat) → 2 AgO(s) + 2 SO 2 (g) 2 AuS(s) + 3 O 2 (g) + (heat) → 2 AuO(s) + 2 SO 2 (g)

20. Agitation Leaching Heap Leaching 95% to 98% recovery lower-cost extraction low-grade deposits Lengthy process (3 mos) 65% to 85% recovery Dissolution of Au 4 Au + 8 NaCN + O 2 + 2 H 2 O → 4 Na[Au(CN) 2 ] + 4 NaOH

21. ELECTROWINNING AuCN 4 - + 2e - Au (s) + 4CN - AgCN - + 2e - Ag (s) + 2CN - Half reactions: Au 3+ (aq) + 3e -  Au (s) Ag + (aq) + e -  Ag (s)

23. TRANSMUTE!

25. Fin