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本帖最后由 德道 于 2010-10-30 22:21 编辑 $ [1 r5 Y# |% D# M
& {8 }- {! g' A' m# ^Burmite or Burmese amber has been known since the distance past. This amber is from the Hukawng Valley in Kachin
- U7 H/ C# q9 i2 ZState the northenmost state in the union of Myanmar formally known as Burma . According to ancient Chinese sources # l( z1 `' t+ M8 h% O( ~4 q
amber from the Hukawng Valley was mined as early as the first century AD and shipped to Yannan Province in China .
" C4 C3 @' P9 LFrom there, burmite may have found its way along the Silk Road as far west as the Roman Empire , where amber was
8 W" H# ^2 D2 ]0 I+ u& Yhighly prized. It is said that that a good piece of amber was worth the price of a slave. The oldest written record referring
5 v( b1 P i0 ^* B! Dto Burmese amber was in the Annals of the Han Dynasty (205-265 AD). Thus, burmite has been known for about two
$ R( S3 z4 c& G/ k- ^" C9 {thousand years. Much of the exquisitely carved Chinese amber has its origin in the Hukwang Valley . Amber was also - i" `4 o8 }9 N
used and is still used in Chinese medicine. 1 j8 G5 N* S, }+ l# e+ G
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The first mention of burmite in the western world by a European was by a Portuguese Jesuit Missionary Father Alvarez
5 J: K& O& A5 g0 _2 E1 D: H) K, YSemedo in 1655. He noted that red amber from Yunnan Province in China . In 1738, there is another brief reference to
/ ^, W( A8 R$ Vred amber from Yunnan Province by Du Halde. : X: r" M& a$ [7 n1 ^- `" K# k
4 |" j; v& z- ?! gIn the 19th Century, there were a series of reports about the location and mining of Burmese amber By Brester (1835) 9 N& f' e& q9 O& E- O# H0 v
and Pemberton (1837). Captain S. F. Hannan was the first westerner to visit the amber mines in the Hukong (Hukawng) ( c; m) Z; [1 i. K
Valley. He described the primitive mining method utilized by the miners to recover amber consisting of digging shallow
& [, L7 n$ J9 ^. T5 ?1 \pits with sharpened bamboo and wooden shovels. Description of the amber mines was given by Griffith in 1848 from the
6 o1 D- t# S4 ^3 K“Hookhoom” Valley. Some pits, he observed were up to forth feet deep. 0 |: w/ ^" V+ I) u) [6 B8 e
$ V- @1 V: O& {" J% S/ _2 h- t: f4 Y. qIn 1885, the British invaded and conquered Upper Burma deposing and sent into exile the Burmese Royal Family to
% T+ j5 o8 G: b" D- }& GIndia . Burma became an annex of India . With the arrival of the British the main trading route in amber went south to 7 V+ ?7 j1 f2 C
Mandalay rather than to China . The Geological Survey of India sent Dr. Fritz Noetling to evaluate the resources of # j/ S3 u8 e) u" `7 G( q) r( g/ z
northern Burma in 1892. Amber recovered from the Hukwang Valley was examined by Otto Helm who gave the name 9 x$ H. u. v3 ? V# Q0 K, o3 y
burmite to the amber from that area. Noetling also noted the presence of insects in amber thought to be from the area in
3 v9 v% |. {6 @+ F+ k: C* E) Q* h1893. ( l7 z' u0 N# ~, R
+ \: m- L; \9 P. }In the first half of the twentieth century, scientific study and production continues until 1939. With the advent of the % f- C: v, A; ^7 M
Second World War, both the production and study languished until the 1990’s. This was due not only to the war but also
8 l6 R; d/ j8 N9 Q3 w' ?internal turmoil within Burma following its independence from Britain in 1947. v5 J( e# g% k% q- [
9 l. ^5 Q" {+ k$ m' {7 vCockerell (1917) published the first scientific paper on insect inclusions in burmite. He considered burmite to be possibly
+ B; g, E2 Q! B/ h; @: n* {Upper Cretaceous in age. The Indian Geological Survey published yearly production figures from the Myitkyina District
5 z6 W+ U: f8 Lfrom 1898 until 1940. During this period a total of approximately 82,656 kilograms of amber were produced from the % n4 q' v& v+ u% p4 q1 \
Hukawng Valley . Scientific papers during this period include work by Stuart (1922), Cocherell (1922), Williamson
/ c$ O$ n: `4 F3 C' p$ @/ v(1932), and Chibber (1934). These authors concluded that the age of burmite was Eocene or about the same age as 9 C: K/ W$ ~( O
Baltic amber. This interpretation was based on a single observation of limestone debris dug from one of the amber pits.
1 h1 {& r0 _. S8 K1 pChibber (1934) contains the most detailed report of the amber mines in the Hukawng Valley during this period.
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During the Second World War there was much fighting in the Hukwang Valley between the advancing allies and the
, C7 o, f) A; j. \! ?Japanese Army culminating in the fierce battle for Myitkyina the capital of Kachin State in 1944. The war also saw the - X1 _7 T \$ | z( ]% e
construction of the Ledo Road through the Hukwang Valley from Ledo in India to Mytiknina to Lashio where it connected
( E: j2 E# }; _7 r* _- Aup with the Burma Road to China . This road provided a back door to supply China with desperately needed war 9 K/ N4 g3 p7 |6 w$ @% m
material.
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Since independence, Burma has been racked by internal insurgencies including fighting between the Kachin
: T; N5 R2 J; B( VIndependence Army (KIA) and the government. It was not until the 1990’s that a peace treaty was signed and limited
3 n G; @: Q4 O1 u6 ]$ O+ paccess to the amber mine was possible. In 1989, the county was renamed Myanmar , which was the original Burmese
- D& p( g Q# |$ W1 x, Q8 zname of the country.
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1 h* v# W8 C0 V' G0 H; CSince the beginning of the Second World War until recently there was been a sixty year hiatus in production. Dr. David % Y/ S) z+ F+ [( }; m: h, m6 Q( \
Grimaldi comments in his book on amber published in 1996, “Today, burmite has almost legendary appeal, in part ) Q @' i2 g$ }% \3 g/ u" e! \
because the deposits are no longer mined and the supply is generally not available.”
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Leeward Capital Corp., a Canadian Mining company began exploration in 1996 in northern Kachin State for gold and
. o, y' J( L5 D+ O- f. bplatinum. With the collapse of the junior mining market due to the Bre-X Scandal in Indonesia and the drop in the gold
. t' L9 @$ h7 l, qprice, this exploration ceased due to the lack of funding. In 1999, Leeward began to evaluate the possibility of reopening - Y" O* ?7 A3 z& M
the amber mines in the Hukwang Valley . Limited production was achieved in 2000, and is currently about 500 kg per ; Z& Z7 F! }! l0 c) u1 K
year. The initial 100 kg gathered in the first two years was sent to Dr. Grimaldi at the American Museum of Natural
p5 p- Y2 [; l7 i! H! sHistory in New York for scientific study. In 2000, Zherikjin and Ross of the Natural History Museum , London published a 7 g' J' W3 S+ P4 x
scientific paper on burmite in which they determined a Cretaceous age for burmite. Grimaldi et al (2002) published a 7 L3 ~" j$ R+ R% m+ @" \6 A
scientific paper confirming the age of burmite as Cretaceous. Also in 2002, Cruichshank and U Ko Ko published a + ]- k: a/ R9 o1 m( O' j3 [! i1 m
description of the amber mines in the Hukwang Valley giving the amber a an Albian or uppermost Lower Cretaceous ! p* S# e5 _5 G" r& X. ? o) H8 a
age. This dates burmite as at between 100,000,000 and 110,000,000 years old. Burmite is thus the oldest locality from 7 P9 d, G- @" ]0 j
which commercial deposits of amber can be mined. Leeward remains the sole exporter of this rare and precious amber. * B$ B# w) t! Y
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Since scientific study of burmite began, there have been numerous scientific papers on the unique biota found in / C( D8 ]* ~2 ?/ L8 S
burmite. This book illustrates the diversity of animal and plant life preserved in this ancient amber. * ^) `$ f) _$ `* \% G& W
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