Answer:
The total amount  to be charged = $(2520000+45000+36000)=$2601000.
Explanation:
Depletion of mineral mine:    
 Purchase price = $12000000	
For the development cost = $4800000	
 Total cost = $16800000	
 Expected production = $1400000
 Cost per unit of activity	= $(16800000/1400000) = $12	
 Activity during 2018 = 210000	
 Depletion = 210000*$12 = $2520000	.
    	
For the depreciation of mining equipment:    
 Purchase price = $360000	
 Less: Residual value = $60000	
 Depreciable value = $300000	
 Expected production = $1400000	
 Cost per unit of activity	= $(300000/1400000) = $0.214286	
 Activity during 2018 = 210000	
 Depreciation = 210000*$0.214286 = $45000	
    	
For the depreciation of Structures:    
 Cost per unit of activity  = $240000	
 Expected production = $1400000	
 Cost per unit of activity	= $(240000/1400000) = $0.171429	
 Activity during 2018 = 210000	
 Depreciation = 210000*$0.171429 = $36000.	
    	
The total amount  to be charged = $(2520000+45000+36000)=$2601000.