A p r i l 2014 C a n adi a n M inin g J o ur n a l 2 7 cr o w n b l as t was co n s i d e r e d t o b e the mos t s ig nif i c a n t Al tho ug h the l o c a ti o n o f the ma jo r e v e n t was o n 3050 L in the 100 O B the d a ma g e was e xt e nd e d acr os s ne a rly a 300m v e r ti c a l b l o c k s ta r tin g f r o m 2700 t o 3710 L A p p r o xima t e ly 3000 t o nnes o f ma t e ri a l w e r e dis p l ace d a t f iv e l o c a ti o n s o n dif f e r e n t l e v e ls The d a ma g e was mos tly as s o ci a t e d w i th e i the r the tr a p dy k es a ndo r 900 Xfa u l t The s u p p o r t sy s t e m a t the d a ma g e l o c a ti o n s ma in ly co n s is t e d o f r es in g r o u t e d r e b a rs a nd me c ha ni c a l ly a nc ho r e d b o l ts in the b ac k a nd a nc ho r e d me c ha ni c a l b o l ts o n the wa l ls t o 15m a b o v e the f l o o r in s ta l l e d thr o ug h 6 ga ug e w e l d e d w ir e mes h A t s o me l o c a ti o n s s ho t cr et e a nd c a b l e b o l ts w e r e us e d as a s e co nd a r y s u p p o r t sy s t e m The in s ta l l e d g r o und s u p p o r t sy s t e m was t o o s tif f in na t ur e a nd i t di d no t p r o v i d e m u c h y i e l din g c a p a b i li ty A cco r din g ly the s u p p o r t sy s t e m tha t was e m p l o y e d a t the d a ma g e d l o c a ti o n s was inc a p a b l e o f ta k in g the im p ac t o f dy na mi c l o adin g c a us e d b y the 38 M n e v e n t I t s ho u l d b e no t e d tha t a ce n tr a l b l as t in g sy s t e m was us e d a nd the C o p p e r C lif f M ine r ee n tr y p r o t o co l a ft e r ma jo r s e is mi c e v e n ts was f o l l o w e d N o p e rs o nne l in j uri es o cc urr e d d u e t o thes e e v e n ts I t has b e e n co nc l u d e d tha t the tr a p dy k e a nd the 900 O B Xfa u l t a r e ma jo r co n tri b u tin g fac t o rs f o r e l e va t e d s e is mi c i ty in the 100 a nd 900 O Bs S ince a l l the s t o p es a l o n g the 900 O B Xfa u l t w e r e mine d o u t o n the minin g f r o n t b etw e e n 3500 a nd 3050 L the na t ur a l co nf ine me n t tha t the o r e b o dy p r o v i d e d t o the fa u l t p l a ne was ta k e n o u t R ock b u r st Cont r ol Aerial view of V ale s Copper Cliff Mine shows the top side of a huge mine that contains many levels of stopes that have undergone extensive work to help reduce the threat of rockbursts