Deckard Jenniffer D.

Row 1 · 2018-03-01 · Grant · Disposed 187,300 · Balance 265,827

F1: The reporting person was granted 187,300 restricted stock units. The restricted stock units vest in 1/4 increments commencing one year after the date of grant.

Row 2 · 2018-06-01 · Disposition to issuer · Disposed 21,366 · Balance 244,461

F2: Reflects disposition in connection with the consummation of the transactions contemplated by the Agreement and Plan of Merger, dated as of December 11, 2017 (the "Merger Agreement"), among the Issuer, SCR-Sibelco NV, Unimin Corporation, nka Covia Holdings Corporation ("Covia"), Bison Merger Sub, Inc. ("Merger Sub") and Bison Merger Sub I, LLC ("Merger Sub LLC"), pursuant to which Merger Sub merged with and into the Issuer with the Issuer as the surviving corporation and for the subsequent merger of Issuer with and into Merger Sub LLC with Merger Sub LLC as the surviving corporation and a wholly owned subsidiary of Covia. In the Merger, each share of Issuer Common Stock, par value $0.01 per share, was exchanged for (i) cash consideration equal to $0.73 per fully diluted share (the "Cash Consideration") and (ii) 0.20 shares (the "Exchange Ratio") of voting common stock, par value $1.00 per share, of Covia ("Covia Common Stock").

Row 3 · 2018-06-01 · Disposition to issuer · Disposed 244,461 · Balance 0

F3: In accordance with the terms of the Merger Agreement, each restricted stock unit award of the Issuer outstanding immediately prior to the effective time of the Merger (whether vested or unvested) was converted into (i) cash in an amount equal to the Cash Consideration multiplied by the number of shares of Issuer Common Stock subject to such Issuer restricted stock award and (ii) a restricted share unit award of Covia with respect to the aggregate number of shares of Covia Common Stock equal to the product of the number of shares of Issuer Common Stock subject to such Issuer restricted stock unit award, multiplied by the Exchange Ratio, rounded up or down the nearest whole unit.

Row 4 · 2018-06-01 · Disposition to issuer · Disposed 57,000 · Balance 0

F4: In accordance with the terms of the Merger Agreement, this performance restricted share unit award ("PSU Award") was converted into (A) a restricted share unit award of Covia with respect to the aggregate number of shares of Covia Common Stock equal to the product of (i) Issuer PSU Awards granted in 2016 ("2016 PSU Award") assuming achievement of 100% of target performance and (ii) the Exchange Ratio, rounded up or down to the nearest whole unit and (B) cash in an amount equal to the Cash Consideration multiplied by the number of shares of Issuer Common Stock subject to 2016 PSU Awards assuming achievement of 100% of target performance.

Row 5 · 2018-06-01 · Disposition to issuer · Disposed 40,432 · Balance 0

F5: In accordance with the terms of the Merger Agreement, this PSU Award was converted into (A) a restricted share unit award of Covia with respect to the aggregate number of shares of Covia Common Stock equal to the product of (i) the Issuer PSU Awards granted in 2017 ("2017 PSU Award") assuming achievement of 133% of target performance, and (ii) the Exchange Ratio, rounded up or down to the nearest whole unit and (B) cash in an amount equal to the Cash Consideration multiplied by the number of shares of Issuer Common Stock subject to 2017 PSU Awards assuming achievement of 133% of target performance.

Row 6 · 2018-06-01 · Disposition to issuer · Disposed 2,098,268 · Balance 0

F2: Reflects disposition in connection with the consummation of the transactions contemplated by the Agreement and Plan of Merger, dated as of December 11, 2017 (the "Merger Agreement"), among the Issuer, SCR-Sibelco NV, Unimin Corporation, nka Covia Holdings Corporation ("Covia"), Bison Merger Sub, Inc. ("Merger Sub") and Bison Merger Sub I, LLC ("Merger Sub LLC"), pursuant to which Merger Sub merged with and into the Issuer with the Issuer as the surviving corporation and for the subsequent merger of Issuer with and into Merger Sub LLC with Merger Sub LLC as the surviving corporation and a wholly owned subsidiary of Covia. In the Merger, each share of Issuer Common Stock, par value $0.01 per share, was exchanged for (i) cash consideration equal to $0.73 per fully diluted share (the "Cash Consideration") and (ii) 0.20 shares (the "Exchange Ratio") of voting common stock, par value $1.00 per share, of Covia ("Covia Common Stock").

Row 7 · 2018-06-01 · Disposition to issuer · Disposed 857,888 · Balance 0

F2: Reflects disposition in connection with the consummation of the transactions contemplated by the Agreement and Plan of Merger, dated as of December 11, 2017 (the "Merger Agreement"), among the Issuer, SCR-Sibelco NV, Unimin Corporation, nka Covia Holdings Corporation ("Covia"), Bison Merger Sub, Inc. ("Merger Sub") and Bison Merger Sub I, LLC ("Merger Sub LLC"), pursuant to which Merger Sub merged with and into the Issuer with the Issuer as the surviving corporation and for the subsequent merger of Issuer with and into Merger Sub LLC with Merger Sub LLC as the surviving corporation and a wholly owned subsidiary of Covia. In the Merger, each share of Issuer Common Stock, par value $0.01 per share, was exchanged for (i) cash consideration equal to $0.73 per fully diluted share (the "Cash Consideration") and (ii) 0.20 shares (the "Exchange Ratio") of voting common stock, par value $1.00 per share, of Covia ("Covia Common Stock").

Row 8 · 2018-06-01 · Disposition to issuer · Disposed 857,888 · Balance 0

F2: Reflects disposition in connection with the consummation of the transactions contemplated by the Agreement and Plan of Merger, dated as of December 11, 2017 (the "Merger Agreement"), among the Issuer, SCR-Sibelco NV, Unimin Corporation, nka Covia Holdings Corporation ("Covia"), Bison Merger Sub, Inc. ("Merger Sub") and Bison Merger Sub I, LLC ("Merger Sub LLC"), pursuant to which Merger Sub merged with and into the Issuer with the Issuer as the surviving corporation and for the subsequent merger of Issuer with and into Merger Sub LLC with Merger Sub LLC as the surviving corporation and a wholly owned subsidiary of Covia. In the Merger, each share of Issuer Common Stock, par value $0.01 per share, was exchanged for (i) cash consideration equal to $0.73 per fully diluted share (the "Cash Consideration") and (ii) 0.20 shares (the "Exchange Ratio") of voting common stock, par value $1.00 per share, of Covia ("Covia Common Stock").

Row 9 · 2018-06-01 · Disposition to issuer · Disposed 102,000 · Balance 0

F2: Reflects disposition in connection with the consummation of the transactions contemplated by the Agreement and Plan of Merger, dated as of December 11, 2017 (the "Merger Agreement"), among the Issuer, SCR-Sibelco NV, Unimin Corporation, nka Covia Holdings Corporation ("Covia"), Bison Merger Sub, Inc. ("Merger Sub") and Bison Merger Sub I, LLC ("Merger Sub LLC"), pursuant to which Merger Sub merged with and into the Issuer with the Issuer as the surviving corporation and for the subsequent merger of Issuer with and into Merger Sub LLC with Merger Sub LLC as the surviving corporation and a wholly owned subsidiary of Covia. In the Merger, each share of Issuer Common Stock, par value $0.01 per share, was exchanged for (i) cash consideration equal to $0.73 per fully diluted share (the "Cash Consideration") and (ii) 0.20 shares (the "Exchange Ratio") of voting common stock, par value $1.00 per share, of Covia ("Covia Common Stock").

Row 10 · 2018-06-01 · Disposition to issuer · Disposed 353,600 · Balance 0

F2: Reflects disposition in connection with the consummation of the transactions contemplated by the Agreement and Plan of Merger, dated as of December 11, 2017 (the "Merger Agreement"), among the Issuer, SCR-Sibelco NV, Unimin Corporation, nka Covia Holdings Corporation ("Covia"), Bison Merger Sub, Inc. ("Merger Sub") and Bison Merger Sub I, LLC ("Merger Sub LLC"), pursuant to which Merger Sub merged with and into the Issuer with the Issuer as the surviving corporation and for the subsequent merger of Issuer with and into Merger Sub LLC with Merger Sub LLC as the surviving corporation and a wholly owned subsidiary of Covia. In the Merger, each share of Issuer Common Stock, par value $0.01 per share, was exchanged for (i) cash consideration equal to $0.73 per fully diluted share (the "Cash Consideration") and (ii) 0.20 shares (the "Exchange Ratio") of voting common stock, par value $1.00 per share, of Covia ("Covia Common Stock").

Row 11 · 2018-06-01 · Disposition to issuer · Disposed 386,543 · Balance 0

F2: Reflects disposition in connection with the consummation of the transactions contemplated by the Agreement and Plan of Merger, dated as of December 11, 2017 (the "Merger Agreement"), among the Issuer, SCR-Sibelco NV, Unimin Corporation, nka Covia Holdings Corporation ("Covia"), Bison Merger Sub, Inc. ("Merger Sub") and Bison Merger Sub I, LLC ("Merger Sub LLC"), pursuant to which Merger Sub merged with and into the Issuer with the Issuer as the surviving corporation and for the subsequent merger of Issuer with and into Merger Sub LLC with Merger Sub LLC as the surviving corporation and a wholly owned subsidiary of Covia. In the Merger, each share of Issuer Common Stock, par value $0.01 per share, was exchanged for (i) cash consideration equal to $0.73 per fully diluted share (the "Cash Consideration") and (ii) 0.20 shares (the "Exchange Ratio") of voting common stock, par value $1.00 per share, of Covia ("Covia Common Stock").

Row 12 · 2018-06-01 · Disposition to issuer · Disposed 1,666 · Balance 5,640

F2: Reflects disposition in connection with the consummation of the transactions contemplated by the Agreement and Plan of Merger, dated as of December 11, 2017 (the "Merger Agreement"), among the Issuer, SCR-Sibelco NV, Unimin Corporation, nka Covia Holdings Corporation ("Covia"), Bison Merger Sub, Inc. ("Merger Sub") and Bison Merger Sub I, LLC ("Merger Sub LLC"), pursuant to which Merger Sub merged with and into the Issuer with the Issuer as the surviving corporation and for the subsequent merger of Issuer with and into Merger Sub LLC with Merger Sub LLC as the surviving corporation and a wholly owned subsidiary of Covia. In the Merger, each share of Issuer Common Stock, par value $0.01 per share, was exchanged for (i) cash consideration equal to $0.73 per fully diluted share (the "Cash Consideration") and (ii) 0.20 shares (the "Exchange Ratio") of voting common stock, par value $1.00 per share, of Covia ("Covia Common Stock").

Row 13 · 2018-06-01 · Disposition to issuer · Disposed 5,640 · Balance 0

F3: In accordance with the terms of the Merger Agreement, each restricted stock unit award of the Issuer outstanding immediately prior to the effective time of the Merger (whether vested or unvested) was converted into (i) cash in an amount equal to the Cash Consideration multiplied by the number of shares of Issuer Common Stock subject to such Issuer restricted stock award and (ii) a restricted share unit award of Covia with respect to the aggregate number of shares of Covia Common Stock equal to the product of the number of shares of Issuer Common Stock subject to such Issuer restricted stock unit award, multiplied by the Exchange Ratio, rounded up or down the nearest whole unit.

Row 14 · 2018-06-01 · Disposition to issuer · Disposed 333,812 · Balance 0

F7: Under the terms of the Merger Agreement, each Issuer stock option outstanding immediately prior to the effective time of the Merger (whether vested or unvested) was converted into an option to purchase shares of Covia Common Stock equal to the product of the aggregate number of shares of the Issuer Common Stock for which the Issuer stock option was exercisable, multiplied by the Exchange Ratio, rounded down to the nearest whole share, with an exercise price equal to the exercise price of the Issuer stock option immediately prior to the closing of the Merger, divided by the Exchange Ratio, rounded up to the nearest cent. Holders of an In-the-Money Option (as defined in the Merger Agreement) that is outstanding immediately prior to the effective time of the Merger received a cash payment equal to the Cash Consideration, multiplied by the aggregate number of such the holder's Cash Consideration Fully Diluted Stock Option Shares (as defined in the Merger Agreement) less taxes.

F6: The option was converted into an option to purchase shares of Covia Common Stock equal to the product of the aggregate number of shares of the Issuer Common Stock for which the Issuer stock option was exercisable, multiplied by the Exchange Ratio, rounded down to the nearest whole share, at an exercise price of $7.15. This option was fully vested and exercisable at the time of the Merger.

Row 15 · 2018-06-01 · Disposition to issuer · Disposed 102,000 · Balance 0

F7: Under the terms of the Merger Agreement, each Issuer stock option outstanding immediately prior to the effective time of the Merger (whether vested or unvested) was converted into an option to purchase shares of Covia Common Stock equal to the product of the aggregate number of shares of the Issuer Common Stock for which the Issuer stock option was exercisable, multiplied by the Exchange Ratio, rounded down to the nearest whole share, with an exercise price equal to the exercise price of the Issuer stock option immediately prior to the closing of the Merger, divided by the Exchange Ratio, rounded up to the nearest cent. Holders of an In-the-Money Option (as defined in the Merger Agreement) that is outstanding immediately prior to the effective time of the Merger received a cash payment equal to the Cash Consideration, multiplied by the aggregate number of such the holder's Cash Consideration Fully Diluted Stock Option Shares (as defined in the Merger Agreement) less taxes.

F8: The option was converted into an option to purchase shares of Covia Common Stock equal to the product of the aggregate number of shares of the Issuer Common Stock for which the Issuer stock option was exercisable, multiplied by the Exchange Ratio, rounded down to the nearest whole share, at an exercise price of $17.85. This option was fully vested and exercisable at the time of the Merger.

Row 16 · 2018-06-01 · Disposition to issuer · Disposed 85,000 · Balance 0

F7: Under the terms of the Merger Agreement, each Issuer stock option outstanding immediately prior to the effective time of the Merger (whether vested or unvested) was converted into an option to purchase shares of Covia Common Stock equal to the product of the aggregate number of shares of the Issuer Common Stock for which the Issuer stock option was exercisable, multiplied by the Exchange Ratio, rounded down to the nearest whole share, with an exercise price equal to the exercise price of the Issuer stock option immediately prior to the closing of the Merger, divided by the Exchange Ratio, rounded up to the nearest cent. Holders of an In-the-Money Option (as defined in the Merger Agreement) that is outstanding immediately prior to the effective time of the Merger received a cash payment equal to the Cash Consideration, multiplied by the aggregate number of such the holder's Cash Consideration Fully Diluted Stock Option Shares (as defined in the Merger Agreement) less taxes.

F9: The option was converted into an option to purchase shares of Covia Common Stock equal to the product of the aggregate number of shares of the Issuer Common Stock for which the Issuer stock option was exercisable, multiplied by the Exchange Ratio, rounded down to the nearest whole share, at an exercise price of $52.30. One-fifth of this option was vested at the time of the Merger. The remaining four-fifths of the option will vest on December 10, 2020.

Row 17 · 2018-06-01 · Disposition to issuer · Disposed 35,700 · Balance 0

F7: Under the terms of the Merger Agreement, each Issuer stock option outstanding immediately prior to the effective time of the Merger (whether vested or unvested) was converted into an option to purchase shares of Covia Common Stock equal to the product of the aggregate number of shares of the Issuer Common Stock for which the Issuer stock option was exercisable, multiplied by the Exchange Ratio, rounded down to the nearest whole share, with an exercise price equal to the exercise price of the Issuer stock option immediately prior to the closing of the Merger, divided by the Exchange Ratio, rounded up to the nearest cent. Holders of an In-the-Money Option (as defined in the Merger Agreement) that is outstanding immediately prior to the effective time of the Merger received a cash payment equal to the Cash Consideration, multiplied by the aggregate number of such the holder's Cash Consideration Fully Diluted Stock Option Shares (as defined in the Merger Agreement) less taxes.

F10: The option was converted into an option to purchase shares of Covia Common Stock equal to the product of the aggregate number of shares of the Issuer Common Stock for which the Issuer stock option was exercisable, multiplied by the Exchange Ratio, rounded down to the nearest whole share, at an exercise price of $80.00. One-third of this option was vested at the time of the Merger. The remaining two-thirds of the option will vest on December 31, 2018.

Row 18 · 2018-06-01 · Disposition to issuer · Disposed 44,000 · Balance 0

F7: Under the terms of the Merger Agreement, each Issuer stock option outstanding immediately prior to the effective time of the Merger (whether vested or unvested) was converted into an option to purchase shares of Covia Common Stock equal to the product of the aggregate number of shares of the Issuer Common Stock for which the Issuer stock option was exercisable, multiplied by the Exchange Ratio, rounded down to the nearest whole share, with an exercise price equal to the exercise price of the Issuer stock option immediately prior to the closing of the Merger, divided by the Exchange Ratio, rounded up to the nearest cent. Holders of an In-the-Money Option (as defined in the Merger Agreement) that is outstanding immediately prior to the effective time of the Merger received a cash payment equal to the Cash Consideration, multiplied by the aggregate number of such the holder's Cash Consideration Fully Diluted Stock Option Shares (as defined in the Merger Agreement) less taxes.

F11: This option, which would have vested on December 31, 2019, was converted into an option to purchase shares of Covia Common Stock equal to the product of the aggregate number of shares of the Issuer Common Stock for which the Issuer stock option was exercisable, multiplied by the Exchange Ratio, rounded down to the nearest whole share, with an exercise price of $44.15.

Row 19 · 2018-06-01 · Disposition to issuer · Disposed 118,000 · Balance 0

F7: Under the terms of the Merger Agreement, each Issuer stock option outstanding immediately prior to the effective time of the Merger (whether vested or unvested) was converted into an option to purchase shares of Covia Common Stock equal to the product of the aggregate number of shares of the Issuer Common Stock for which the Issuer stock option was exercisable, multiplied by the Exchange Ratio, rounded down to the nearest whole share, with an exercise price equal to the exercise price of the Issuer stock option immediately prior to the closing of the Merger, divided by the Exchange Ratio, rounded up to the nearest cent. Holders of an In-the-Money Option (as defined in the Merger Agreement) that is outstanding immediately prior to the effective time of the Merger received a cash payment equal to the Cash Consideration, multiplied by the aggregate number of such the holder's Cash Consideration Fully Diluted Stock Option Shares (as defined in the Merger Agreement) less taxes.

F12: The option was converted into an option to purchase shares of Covia Common Stock equal to the product of the aggregate number of shares of the Issuer Common Stock for which the Issuer stock option was exercisable, multiplied by the Exchange Ratio, rounded down to the nearest whole share, at an exercise price of $10.20. Two-thirds of this option was vested at the time of the Merger. The remaining one-third of the option will vest on March 1, 2019.

Row 20 · 2018-06-01 · Disposition to issuer · Disposed 50,700 · Balance 0

F7: Under the terms of the Merger Agreement, each Issuer stock option outstanding immediately prior to the effective time of the Merger (whether vested or unvested) was converted into an option to purchase shares of Covia Common Stock equal to the product of the aggregate number of shares of the Issuer Common Stock for which the Issuer stock option was exercisable, multiplied by the Exchange Ratio, rounded down to the nearest whole share, with an exercise price equal to the exercise price of the Issuer stock option immediately prior to the closing of the Merger, divided by the Exchange Ratio, rounded up to the nearest cent. Holders of an In-the-Money Option (as defined in the Merger Agreement) that is outstanding immediately prior to the effective time of the Merger received a cash payment equal to the Cash Consideration, multiplied by the aggregate number of such the holder's Cash Consideration Fully Diluted Stock Option Shares (as defined in the Merger Agreement) less taxes.

F13: The option was converted into an option to purchase shares of Covia Common Stock equal to the product of the aggregate number of shares of the Issuer Common Stock for which the Issuer stock option was exercisable, multiplied by the Exchange Ratio, rounded down to the nearest whole share, at an exercise price of $50.15. One-third of this option was vested at the time of the Merger. The remaining two-thirds of the option will vest on March 1, 2019 and March 1, 2020 in equal increments.