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<blockquote data-quote="Kurtr" data-source="post: 267608" data-attributes="member: 194">Actually there is a lot of crushing of natural rock most of it being for asphalt but shale is not allowed in there either.&nbsp; Dickinson is home to one of the biggest aggregate producers in the nation being fisher industries.&nbsp; A lot of lime stone is brought in on the west side from pete liens quarry by rapid or just in Wyoming.&nbsp; Fishers also has a quarry over there along with knife river.&nbsp; Lg Everest takes care of a lot of granite on the east side.&nbsp; Airports are a whole level of suck above any thing else to work on.&nbsp; All the natural round rock is washed before it is used for concrete I would be surprise if it is over 1% shale retained on the gradations if that .07% on the plus 4 sieve is all that is allowed in dot mixes up there.&nbsp; I tested every very bit of asphalt from minot to Williston on hiway 2 and all of that was natural rock crushed in local pits with shale content of 3% or lower also did tioga and Williston airports still have nightmares of the Williston one.&nbsp; The devils lake airport was also a real mf er</blockquote>

[QUOTE="Kurtr, post: 267608, member: 194"] Actually there is a lot of crushing of natural rock most of it being for asphalt but shale is not allowed in there either. Dickinson is home to one of the biggest aggregate producers in the nation being fisher industries. A lot of lime stone is brought in on the west side from pete liens quarry by rapid or just in Wyoming. Fishers also has a quarry over there along with knife river. Lg Everest takes care of a lot of granite on the east side. Airports are a whole level of suck above any thing else to work on. All the natural round rock is washed before it is used for concrete I would be surprise if it is over 1% shale retained on the gradations if that .07% on the plus 4 sieve is all that is allowed in dot mixes up there. I tested every very bit of asphalt from minot to Williston on hiway 2 and all of that was natural rock crushed in local pits with shale content of 3% or lower also did tioga and Williston airports still have nightmares of the Williston one. The devils lake airport was also a real mf er [/QUOTE]

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