Document NEmB0LoqjeY0aBDowkb3kJKmV

16 t / > <Um lacuJ c ^_^_R 639 CHARACTERIZATION AND OCCURRENCE OF TALC l i T j H. T. M ulryan1 My name i s H. T. M u lry an . I a n .p r e s i d e n t o f C yprus M ines C o r p o r a t i o n 's U nited S ie rra D iv isio n . The d iv is io n is th e w o rld 's la r g e s t producer o f ta lc in terms o f p ro d u ct v a lu e . I t o p e ra te s ta lc m ines in th e s ta te s o f M ontana, Nevada, C a lif o r n ia , and Texas and t a l c p ro c e ssin g u n its in -he S ta te s o f M ontana, C a lif o r n ia , and N ebraska, Belgium , and through an a f f i l i a t e , M exico. T h e .d i v i s i o n em ploys a b o u t 18 p e rs o n s a t i t s t a l c p r o d u c tio n u n i t s . A pproxim ately h a lf o f them work in our M ontana m ines and m il ls , th e rem ainder a r e s c a t t e r d among th e o t h e r e ig h t t a l c l o c a t i o n s . The M ontana p ro d u c t approaches th e p u r ity o f pure ta lc m in eral and i t s h a b it i s p la ty or g ra n u la r, d ep en d in g on t h e m a t e r i a l s o u r c e and f in e n e s s o f g r i n d . F ig u r e s 1 nH 2 i l l u s t r a t e th e n a tu re of th e p a r tic le s by tra n sm issio n and scanning e le c tro n m icroscope, re sp e c tiv e ly . On th e o t h e r h a n d , m ix tu r e s o f m in e r a l s from o t h e r s o u r c e s may c o n ta i n l i t t l e o r no t a l c m in e ral and s t i l l be c o r r e c tly known com m ercially as " t a l c .' F ig u re s 3 and 4 show th e p a r t i c l e sh ap es o f " ta l c s " from th e G ouverneur d i s t r i c t o f New Y ork S t a t e . The n e e d le s o r f i b e r s a r e m a in ly t r e m o l i t e w ith a n th o p h y llite a ls o commonly p re s e i c. T his ty p e o f com m ercial t a l c i s n o t c o n f in e d t o New Y ork S t a t e , b e in g e x te n siv e ly mined and p ro cessed in C a lif o r n ia . T able 1 compares th e m in e ral c o n te n t o f t a l c from New Y o rk , C a l i f o r n i a , and M ontana. The S i l v e r L a k e , C a l i f . , t r e m o l i t i c t a l c i s s i m i l a r t o a t y p i c a l New Y ork S t a t e t a l c e x c e p t fo i th e m issing a n th o p h y llite and q u artz im p u ritie s. TABLE I.* - C om parison o f m in e r a l c o n te n t o f t a l c from New Y ork. . C a lif o r n ia , and M ontana, in p ercen t Talc type Talc Carbonate T rem olite A n th o p h y llite Q uartz New Y ork............................ 62 - 30 53 S ilv e r Lake, C a l i f . . . 54 3 43 - -* O ther .. - P a n a m in t, C a l i f ............ 82 12 - - T race 2 Mont. Yellowstone*, H o n t u ^ 99 B eav erh ead , M ont.......... 98 1 1 - 4 M ica. < 0 .5 - 1 C hloritf 1P re s id e n t, Cyprus Mines C o r p o ra tio n 's U n ited S ie r r a D iv isio n . CAMC-Abeyta-001956 eip al Im p u rities^w ith ^o ^sb esto s ^ r esen i^ Y e llo w sto n e and B e a v e rh e a d , a r e h ig h p u r i t / a n H L L 'e T f 11 " iCa * * p r in - p r o d u c tio n v o r k S ^ S ^ i ^ i u r k S S S S s ^ 8 C * p o r a t i o n t 0 x * ray th e m -r* e f f e c t f o r 5 y e a r s and th e s e P U c ? haS bee* * i .1i :^ p le u r a l c a n c e r among o u r t a l c w o rk ers nor w . tory d isease of any kind. * b ve P * * * lung o r they rev ealed chronic re s p ira - 1 t E 'E ^ e S i S '^ ^ S ^ S T * !. JXk tr e m o lltlc ta lc s as w f ll '* 25 to 44 years ago. i H e . ve became c m c e m e d ^ i t ' t S ' p o i s i b i i i ^ ^ h 1! " 1CS " " ir s t "ade pub' vertencly exposed to a health h a tL " ^ o f " ^ a p T ^ ha<1 * " in>d- amoimts o f ' t r m o l l l e ^ n d e s t a b l i s h e d ^ r r ^ I I " 1" eo n tl,ln ln S d e te c ta b le C a lifo rn ia mines to assure co a tio l^ * d irm :1 f a c i l i t y a t our i ex-em ployees v e re s u b je c te d t o ^ i h a u S l i e ^ o W s l 08? ^ ' ' " l t h foU r r e t t r e e s and on th e r e s p i r a t o r y sy ste m c h e s t and ahd P ^ C1 e x a m in a tio n s w ith em phasis 1 = d u st ranged from 2 ? l o " * * * ^ o s u r a to ' but n eith er were S u in g nor m iU iJ ^ 7 * " J * l U f the 2 0 *s and 1930's , I*1<-*- ,V " ajor aooun o ts bj o e f ct d ive ust . t h The old an h is time worker modern coun was terp ^he art* r e f 518" ' 6'1 " W P ith dUSt S<id " v coa ast tro l2 1 r 38 en t a er c a u c e r '^ '^ f ^ 'l ^ ^ r f a llrd " te c t any sig n of **" o f p o L l b L ^ n ^ o c S ; s ! " 1 ?rO U P - " U e reveal r f ^ f " n f ci n r n " ^ ' a S i sL ln t t h i n p rr :edine i s * P re s e n te d a r e a d m itte d ly lim ite d t, ^ t r u t h . A lth o u g h th e m e d ic a l d a ta ith er the pure M o S a S t ^ f or ie 7 ^ Cation that ta lc s of ca rcin o g en ic. Mntana t * ,e or l e s s P C a lifo r n ia v a r i e t i e s are ,, t b * h" ich " " p - t z Sri- aw i" e if o T tif S n ^ r n .^ :: it: CAMC-Abeyta-001957