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本帖最后由 德道 于 2010-10-30 22:21 编辑 : C) J' H# j9 H ?/ m% q
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Burmite or Burmese amber has been known since the distance past. This amber is from the Hukawng Valley in Kachin
" R- |4 G1 R! s- hState the northenmost state in the union of Myanmar formally known as Burma . According to ancient Chinese sources ! A8 q3 _& Q- l2 \$ q
amber from the Hukawng Valley was mined as early as the first century AD and shipped to Yannan Province in China . |% x8 m$ b6 R3 o
From there, burmite may have found its way along the Silk Road as far west as the Roman Empire , where amber was
+ {# b; @) ]6 o& lhighly prized. It is said that that a good piece of amber was worth the price of a slave. The oldest written record referring 5 M$ d0 _8 }6 O! q' A8 j
to Burmese amber was in the Annals of the Han Dynasty (205-265 AD). Thus, burmite has been known for about two 7 l+ Y" N; E, R2 p' G5 J0 j( ^
thousand years. Much of the exquisitely carved Chinese amber has its origin in the Hukwang Valley . Amber was also " l* O: L( t2 E, j( x, ]9 h* @
used and is still used in Chinese medicine. ' C2 Q# J' l8 _0 |* a4 J1 Q$ e" n
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The first mention of burmite in the western world by a European was by a Portuguese Jesuit Missionary Father Alvarez 2 r' l x+ a6 |& l1 R+ q
Semedo in 1655. He noted that red amber from Yunnan Province in China . In 1738, there is another brief reference to 1 E( n' F7 i% C& q
red amber from Yunnan Province by Du Halde. % z# c. \1 e& S9 x' _( i* F
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In the 19th Century, there were a series of reports about the location and mining of Burmese amber By Brester (1835)
5 ~5 i5 o/ N3 i2 {, t8 s0 _and Pemberton (1837). Captain S. F. Hannan was the first westerner to visit the amber mines in the Hukong (Hukawng) / D; ]0 U4 ?# k
Valley. He described the primitive mining method utilized by the miners to recover amber consisting of digging shallow 7 p# h2 R4 P1 O! M
pits with sharpened bamboo and wooden shovels. Description of the amber mines was given by Griffith in 1848 from the 8 A0 v2 T; @# \0 a6 _# I
“Hookhoom” Valley. Some pits, he observed were up to forth feet deep. ; T p- v+ l/ o: m$ D
. w% w) K2 i+ ?8 U( d: F/ r+ z, VIn 1885, the British invaded and conquered Upper Burma deposing and sent into exile the Burmese Royal Family to
7 N1 E; f' i. ~ F! H7 O" g- [. uIndia . Burma became an annex of India . With the arrival of the British the main trading route in amber went south to ( ^0 ~5 ~" Q/ }+ S: m# d# ]
Mandalay rather than to China . The Geological Survey of India sent Dr. Fritz Noetling to evaluate the resources of : z: a& A5 p( k b6 N+ H
northern Burma in 1892. Amber recovered from the Hukwang Valley was examined by Otto Helm who gave the name ( h' S' D3 f( `. X1 D1 @
burmite to the amber from that area. Noetling also noted the presence of insects in amber thought to be from the area in 8 s! E# q& p: s& a9 a
1893.
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0 h, [. a2 x7 N* hIn the first half of the twentieth century, scientific study and production continues until 1939. With the advent of the
! Y2 l7 Q. Z: t. \' \Second World War, both the production and study languished until the 1990’s. This was due not only to the war but also
+ @1 u5 u; D2 ~6 v' I7 d5 winternal turmoil within Burma following its independence from Britain in 1947. 3 D) }! ]/ {& b* B9 N3 l P w
3 c" C5 T+ [- L8 c% l8 _) mCockerell (1917) published the first scientific paper on insect inclusions in burmite. He considered burmite to be possibly
* w9 }$ h# I9 V' zUpper Cretaceous in age. The Indian Geological Survey published yearly production figures from the Myitkyina District & C! x0 F: y9 `
from 1898 until 1940. During this period a total of approximately 82,656 kilograms of amber were produced from the ( u: y9 d# P" R D7 s5 T* \
Hukawng Valley . Scientific papers during this period include work by Stuart (1922), Cocherell (1922), Williamson - g, j( U$ A6 }7 y
(1932), and Chibber (1934). These authors concluded that the age of burmite was Eocene or about the same age as / S+ G: E) ]) Z- Q
Baltic amber. This interpretation was based on a single observation of limestone debris dug from one of the amber pits.
/ i' j# W j% K0 m) l; f; BChibber (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 2 V3 V. \# M, G# T* s b
Japanese Army culminating in the fierce battle for Myitkyina the capital of Kachin State in 1944. The war also saw the
7 }# _( U: L! h- F( b6 K) Aconstruction of the Ledo Road through the Hukwang Valley from Ledo in India to Mytiknina to Lashio where it connected ( [: W7 T$ u; Z' F0 k* d
up with the Burma Road to China . This road provided a back door to supply China with desperately needed war
, s( ? J3 N) F& K# l1 Jmaterial. # U# D. Y, U& U, m! O! T* f& b2 }
7 ~& [* r) h; m7 h- JSince independence, Burma has been racked by internal insurgencies including fighting between the Kachin
4 z5 |/ h6 S+ U: n* A% ] P. s1 OIndependence Army (KIA) and the government. It was not until the 1990’s that a peace treaty was signed and limited 2 ~. N/ T; W: z# I) k4 k
access to the amber mine was possible. In 1989, the county was renamed Myanmar , which was the original Burmese
7 C L# _4 F+ `name of the country. + B0 h8 I1 S4 M l9 P% }
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Since the beginning of the Second World War until recently there was been a sixty year hiatus in production. Dr. David 1 u `$ [$ \4 T/ J
Grimaldi comments in his book on amber published in 1996, “Today, burmite has almost legendary appeal, in part * |) x+ u: G/ X0 g
because the deposits are no longer mined and the supply is generally not available.” ' p& p8 D. E+ U+ J
& m' K2 o6 z7 b5 `Leeward Capital Corp., a Canadian Mining company began exploration in 1996 in northern Kachin State for gold and
/ M1 `% F* a6 ?4 I' H) Qplatinum. With the collapse of the junior mining market due to the Bre-X Scandal in Indonesia and the drop in the gold
% p- c( f* R, i- }$ L& ?4 Eprice, this exploration ceased due to the lack of funding. In 1999, Leeward began to evaluate the possibility of reopening % q( F+ x& e; r, u2 ^* h+ m) ~! E
the amber mines in the Hukwang Valley . Limited production was achieved in 2000, and is currently about 500 kg per ) A( ?% o/ t U; H- \# K
year. The initial 100 kg gathered in the first two years was sent to Dr. Grimaldi at the American Museum of Natural $ k" w$ M+ ?1 W S3 `, u
History in New York for scientific study. In 2000, Zherikjin and Ross of the Natural History Museum , London published a
- z) O9 {% `$ }/ J* N# Tscientific paper on burmite in which they determined a Cretaceous age for burmite. Grimaldi et al (2002) published a
" ^ H$ h! B+ R+ q U2 P5 cscientific paper confirming the age of burmite as Cretaceous. Also in 2002, Cruichshank and U Ko Ko published a 4 R8 T I/ ]1 o6 I, R
description of the amber mines in the Hukwang Valley giving the amber a an Albian or uppermost Lower Cretaceous {% n% \2 J' T1 Q5 L8 l5 x4 f4 \
age. This dates burmite as at between 100,000,000 and 110,000,000 years old. Burmite is thus the oldest locality from
+ y8 b3 q2 X6 h& y* o' ^which commercial deposits of amber can be mined. Leeward remains the sole exporter of this rare and precious amber. # {6 @' v0 {* |
) P* Y8 n5 C+ Y1 qSince scientific study of burmite began, there have been numerous scientific papers on the unique biota found in , U. r8 R# J$ R( ~9 q$ n7 C
burmite. This book illustrates the diversity of animal and plant life preserved in this ancient amber. ) x( h7 p1 ]3 Y" w" {
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