the site says there is the boss right outside of copperhammer mines spawns randomly, i zoned in and out about 10 times but i havnet seen him. how close is he to copperhammer mines? is he past the birds or jsut in the group right abouve the mines?
http://www.guildwarsguru.com/skill/114-cleave
Where is the boss outside of Coppermines to get Cleave?
smiling-kittens
Josh
Information courtesy of GWFreaks.com 
Linka Goldensteel
Linka Goldensteel
Meric Hellhammer
there is also a boss in iron mines with cleave you'll find him along an infusion run where u pass through the second big battle between the stone summit and White mantle
VampiricuS
i used capture signet on a guy during the Ice Caves of Sorrow mission and snagged Cleave off him. Its "ok".
Necrotic
"Ok" he says.....my Wa/Ra just capped it a little while ago and there are times it hits in the 90s for damage. Usually it does around 40-70, but it takes what....4 hits to activate? Very good skill to use IMO. But then I mostly PvE.