Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Income Statement [Abstract]
Net revenues
Operating expenses:
Compensation and related taxes	224,109	462,668	1,875,367	913,681
Exploration costs	932,182	988,476	2,236,461	1,225,214
Professional fees	463,714	155,820	1,990,401	1,336,034
General and administrative expenses	148,243	41,482	544,600	205,793
Total operating expenses	1,768,248	1,648,446	6,646,829	3,680,722
Operating loss from operations from continuing operations	(1,768,248)	(1,648,446)	(6,646,829)	(3,680,722)
Other income (expense):
Interest expense				(4,242)
Total other expense				(4,242)
Loss from continuing operations before provision for income taxes	(1,768,248)	(1,648,446)	(6,646,829)	(3,684,964)
Provision for income taxes
Loss from continuing operations	(1,768,248)	(1,648,446)	(6,646,829)	(3,684,964)
Discontinued operations:
Gain (loss) from discontinued operations	3,428		(5,925,640)
(Loss) gain from sale of discontinued operations	(7,538)		94,485
Total (loss) gain from discontinued operations	(4,110)		(5,831,155)
Net loss	$ (1,772,358)	$ (1,648,446)	$ (12,477,984)	$ (3,684,964)
Loss per common share, basic and diluted
Loss from continuing operations	$ (0.12)	$ (0.16)	$ (0.55)	$ (0.38)
Discontinuing :
Operations			(0.49)
Gain (loss)			0.01
Total discontinuing operations			(0.48)
Net loss per share	$ (0.12)	$ (0.16)	$ (1.03)	$ (0.38)
Weighted average common shares outstanding - basic and diluted	14,400,023	10,300,000	12,152,505	9,610,326