Hello! Can you analyze the inventory of this company, if its good or bad? what does it mean when an inventory increase from 2017-2018?

NICKEL ASIA CORP 153/260 6. Inventories 2018 P2,700,539 539.222 2017 P2,432,633 434,178 Beneficiated nickel ore and limestone - at cost Beneficiated nickel ore - at NRV Materials and supplies: At NRV At cost Current portion of long-term stockpile inventory (see Note 12) 437,780 11,427 210,612 212,980 55,306 P3,744,274 212,011 P3,502,414 The movements of allowance for impairment losses on inventories follows: Beneficiated nickel ore P68,241 2018 Balances at January 1 Provisions (see Note 31) Reversals (see Note 31) Balances at December 31 Materials and supplies P17,384 18,966 Total P85,625 18,966 (1,718) P102,873 (1,718) P66,523 P36,350 Beneficiated nickel ore P74,345 2017 Balances at January 1 Provisions (see Note 31) Reversals (see Note 31) Balances at December 31 Materials and supplies P10,036 7,348 Total P84,381 7,348 (6,104) P85,625 (6,104) P68,241 P17,384 2 As at December 31, 2018 and 2017, the cost of beneficiated nickel ore and limestone provided with allowance for impairment losses amounted to P3,361.6 million and P3,147.1 million, respectively, while the cost of materials and supplies provided with allowance for impairment losses amounted to P485.6 million and P441.0 million, respectively, Costs of inventories charged as expense amounted to P7,271.1 million, P6,410.6 million and P6,228.8 million in 2018, 2017 and 2016, respectively (sce Notes 21, 22, 23, 24, 26 and 31)