Pit & Quarry, November 2009
P O R T A B L E P L A N T S crush onsite completely We dont sell them to outside contractors because we dont want to cut into the local economy There are quarries here that produce rock for sale Our forte is in taking care of our own work he said It might seem strange that a general contractor would require such large crushing equipment but crushing rock in Hawaii isnt always the paradise one might envision Hawaiis blue rock a volcanic traprock provides unique challenges for crushing operations While most people are aware that the Hawaiian islands were created by volcanoes and that the volcano on Big Island of Hawaii is still actively shaping its geography today not all volcanic rock on the islands looks like the glassy black rock shards that tourists traditionally love to collect The recognizable glass like rock comprises a thin top layer where the molten lava has chilled quickly The Goodfellow Bros purchased this FLSmidth Excel XL400 cone crusher plant to replace its VSI crusher layers underneath the smooth rock contain crystallized minerals and an abundance of iron and magnesium The bluish gray color of this deeper rock is the reason for its name When site work exposes the interior of a thick lava flow the material no longer contains gas vesicles or holes and the mineral grains are larger This material is very dense and very tough to break At the same time blue rock provides some of the best grade construction aggregates 38 PIT QUARRY November 2009 www pitandquarry com
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