Tweleve bundles of detonator fuse, detonating wire, 11 landmines, 22 electronic detonators and a digital detonating device were recovered following leads provided by a arrested Maoist leader.
The explosives were kept hidden in a cave and in two others places in the hills, Superintendent of Police, Karthik S said.
The explosives were destroyed in the hills.
Meanwhile, Additional Director General of Police R K Mallick described this week's arrest of 15 Maoists including three top rank rebels of Giridih district, who were carrying altogether Rs 35 lakhs reward on their heads, and recovery of 13 firearms without firing a bullet as a historic achievement.
Inspector General Ashish Batra said 12 Maoists were eliminated within a month.