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Stockholders’ equity (Tables)
6 Months Ended
Jun. 30, 2023
Equity [Abstract]  
Schedule of Share- based Payment Arrangement, Warrant Activity

A summary of warrant activity for the quarter ended June 30, 2023 are as follows:

 

   Number of warrants   Exercise price   Expiry date
Outstanding, December 31, 2022   230,000    CAD$0.98   April 3, 2023
              
Granted   -    -    
Expired unexercised   (230,000)   CAD$0.98    
              
Outstanding June 30, 2023   -    -    
Schedule of Fair Value of Warrants Assumptions

   June 30, 2023   December 31, 2022 
Exercise price   CAD$0.98    CAD$0.98 
Stock price   CAD$0.25    CAD$0.35 
Expected term   3 days    0.25 years 
Expected dividend yield   -    - 
Expected stock price volatility   97.90%   77.46%
Risk-free interest rate   3.12%   3.55%
Schedule of Share-based Payment Arrangement, Option, Activity

   Number of options   Weighted average exercise price 
Outstanding, December 31, 2021   6,870,150   $0.48 
           
Granted   2,550,000    0.40 
Expired   (506,150)   (0.40)
Cancelled   (285,600)   (0.48)
           
Outstanding, December 31, 2022   8,629,000   $0.43 
           
Granted   1,885,000    0.30 
Expired   (1,988,000)   (0.46)
Cancelled   (130,000)   (0.52)
           
Outstanding June 30, 2023   8,396,000   $0.39 
Schedule of Share-based Payment Arrangement, Option, Exercise Price Range

The following table summarizes information concerning outstanding and exercisable stock options at June 30, 2023:

 

Exercise
prices per share
   Number outstanding   Number exercisable   Expiry date
 CAD$0.30    1,885,000    150,800   February 21, 2028
 CAD$0.45    2,030,400    1,123,800   June 30, 2025
 CAD$0.50    829,600    505,700   February 1, 2026
 CAD$0.50    2,395,000    766,400   February 1, 2027
 CAD$0.66    200,000    92,000   July 12, 2026
 CAD$1.02    1,056,000    552,000   April 6, 2026
      8,396,000    3,190,700