Packet 5: Bonus 19

American investors funded the extraction of these elements from Brazil’s Serra Verde as an alternative to their Mountain Pass Mine in San Bernardino County. For 10 points each:
[10e] Name this group of elements mined from Inner Mongolia’s Bayan Obo District. Xú Guāngxiàn developed processing methods for these elements, giving China a near monopoly over part of the electronics value chain.
ANSWER: rare earths [or rare earth metals or rare earth elements or REEs; accept lanthanides or lanthanoids; prompt on stable f-block elements or (inner) transition metals]
[10h] An extraterritorial trade rule of this name now subjects any product to Chinese export controls if it contains over 0.1 percent of Chinese rare earths. In 2025, the US ended an exemption of this name for shipments under an 800-dollar threshold.
ANSWER: de minimis [accept de minimis exemption or de minimis threshold or de minimis rule]
[10m] China imports rare earths from this northernmost state of Burma. This state’s eponymous ethnic group, which is largely Christian, formed an “Independence Army” that has fought the Tatmadaw over jade and ruby mines.
ANSWER: Kachin State [or Kahkyinpyinaal; or Jinghpaw Mungdaw; or Kèqīn bāng or K’och’in pang; accept Kachins, Ga Hkyeng, Jinghpaw, Jǐngpō, Wunpong, or Chingp’o; accept Kachin Independence Army, Kahkyinlwatlautrayytautmataw or Wunpawng Mungdan Shanglawt Hpyen Dap]
<Indiana, Current Events> | E. Prelims 5 - Indiana + Vanderbilt + MIT

HeardPPBE %M %H %
818.75100%25%63%

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Conversion

TeamOpponentPart 1Part 2Part 3TotalParts
Columbia AVirginia100010E
Columbia BPittsburgh10101030EHM
Georgia Tech CToronto B100010E
Maryland AWaterloo10101030EHM
Ohio StateGeorgia Tech A100010E
Stanford AChicago B1010020EH
TexasHarvard1010020EH
Toronto AMinnesota1010020EH

Summary

TournamentEditionMatchHeardPPBE %M %H %
Main Site2026-04-17✓818.75100%25%63%