Mineral Rights and Properties (Narrative) (Details)			1 Months Ended	12 Months Ended
	Oct. 14, 2021 USD ($) a shares	Sep. 07, 2021 USD ($) a shares	Oct. 26, 2020 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) a	Mar. 31, 2021 USD ($)
Property, Plant and Equipment [Line Items]
Area of land | a				43,971
Payment to purchase mineral property				$ 8,650,700	$ 12,807,130
DTRC common stock issued for investment in mineral property				10,380,464	1,320,000
Mineral properties				$ 76,962,958	$ 57,931,794
Richmond Hill Property [Member]
Property, Plant and Equipment [Line Items]
Area of land | a				2,126
Surface Rights And Certain Residual Facilities [Member]
Property, Plant and Equipment [Line Items]
Area of land | a				3,201
Homestake Gold Mine [Member]
Property, Plant and Equipment [Line Items]
Area of land | a				4,261
Nine Brownfield Project Areas [Member]
Property, Plant and Equipment [Line Items]
Unpatented claims held				$ 1,905
Area of land | a				32,256
Barrick Gold Corporation [Member] | Maitland Gold Property [Member]
Property, Plant and Equipment [Line Items]
DTRC common stock issued for investment in mineral property			$ 3,500,000
Stock issued during period, shares, purchase of assets | shares			750,000
Issued price per share | $ / shares			$ 1.76
Asset acquisition, consideration transferred			$ 4,820,000
Percentage of net smelter return royalty owned			2.50%
Barrick Gold Corporation [Member] | Richmond Hill Property [Member]
Property, Plant and Equipment [Line Items]
Area of land | a	2,126
DTRC common stock issued for investment in mineral property	$ 1,816,000
Stock issued during period, shares, purchase of assets | shares	400,000
Asset acquisition, consideration transferred	$ 100,000
Additional shares to be issued upon exercise of option | shares	400,000
Percentage of net smelter return royalty owned	1.00%
Barrick Gold Corporation [Member] | Surface Rights And Certain Residual Facilities [Member]
Property, Plant and Equipment [Line Items]
Area of land | a		4,261
Payment to purchase mineral property		$ 1,300,000
DTRC common stock issued for investment in mineral property		$ 4,850,000
Stock issued during period, shares, purchase of assets | shares		1,000,000
Asset acquisition, consideration transferred		$ 300,000
Additional shares to be issued upon exercise of option | shares		3,000,000
Percentage of net smelter return royalty owned		2.50%