Stock options (Tables)

12 Months Ended

Oct. 31, 2018

Statements Line Items

Disclosure of number and weighted average exercise prices of share options

	Number of			Weighted average
	options			exercise price
Outstanding at November 1, 2016	4,395,000		$	0.45
Granted	2,890,000			0.25
Expired	(690,000	)		(0.35	)
Outstanding at October 31, 2017	6,595,000		$	0.37
Granted	2,200,000			0.10
Expired	(2,545,000	)		0.34
Outstanding at October 31, 2018	6,250,000		$	0.29

Disclosure of number and weighted average remaining contractual life of outstanding share options

				Weighted average
					Remaining
		Number of			contractual life
Date of issue	Expiry Date	options		Exercise price	(years)
February 10, 2014	February 10, 2019	350,000	$	0.85	0.3
April 25, 2014	April 25, 2019	170,000		0.64	0.5
June 4, 2015	June 4, 2020	300,000		0.49	1.6
August 20, 2015	August 20, 2020	940,000		0.46	1.8
September 30, 2015	September 30, 2020	250,000		0.40	1.9
December 30, 2016	December 30, 2021	2,040,000		0.25	3.2
June 29, 2018	June 29, 2023	2,200,000		0.10	4.7
Outstanding and exercisable at October 31, 2018		6,250,000	$	0.29	3.1

Disclosure of detailed information about options, valuation assumptions

		2018		2017
Share price at grant date (per share)	$	0.09	$	0.21
Exercise price	$	0.10	$	0.25
Volatility factor (based on historical volatility)		95%		100%
Risk free interest rate		2.07%		0.72%
Expected life of options (in years)		5		5
Expected dividend yield		0%		0%
Forfeiture rate		0%		0%
Weighted average Black Scholes value at grant date	$	0.06	$	0.15