2.4.0.81050 - Disclosure - Mineral Propertiestruefalsefalse1false falsefalseD2014Q1http://www.sec.gov/CIK0001477032duration2013-04-01T00:00:002013-06-30T00:00:001true 1us-gaap_ExtractiveIndustriesAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Mineral Properties2false 2us-gaap_MineralIndustriesDisclosuresTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00<div style="font-size:10.0pt;font-family:Times New Roman;"> Note 5 — Mineral Properties   Additions to mineral properties include development costs such as engineering, environmental studies, drilling, allocated compensation including employee salaries, employee bonuses and employee and non-employee stock compensation, and other costs related to development of the Holbrook Project.   The recoverability of the carrying values of the Company’s mineral properties is dependent upon the successful start-up and commercial production from, or sale or lease of, these properties and upon economic reserves being discovered or developed on the properties. The Company believes that the fair value of its mineral properties exceeds the carrying value; however, events and circumstances beyond our control may mean that a write-down in the carrying values of the Company’s properties may be required in the future as a result of the economic evaluation of potash production and the application of an impairment test based on estimates of potash quantities, exploration land values, future advanced minimum royalty payments and potash selling prices, among other variables. </div>falsefalsefalsenonnum:textBlockItemTypenaThe entire disclosure for mineral industries.No definition available.false0Mineral PropertiesfalseMineral PropertiesUnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.prospectgri.com/role/DisclosureMineralProperties12