Overburden characteristics

“Kari­er­na” Sec­tion
Above Seam I, the over­bur­den con­sists of allu­vial grav­el-and-peb­ble deposits with an aver­age thick­ness of 7.9 m. The inter­val between Seams I and II con­sists main­ly of argillite-like clays, tuffites, silt­stones and sands, with a thick­ness of 3–10 m.

“Kreminna” Sec­tion
Seam IV is over­lain by allu­vial-delu­vial loams, boul­der-and-peb­ble for­ma­tions and a grav­el-sand mix­ture, with a thick­ness of 3.0–13.8 m.
Seam V is over­lain by clays and argillites, with less­er amounts of silt­stones, sands and tuffites.

Overburden volumes

“Kari­er­na” Sec­tion
Seam I: over­bur­den vol­ume — 557.40 thou­sand m³; strip­ping ratio — 5.69 m³/t.
Seam II: over­bur­den vol­ume — 4,917.87 thou­sand m³; strip­ping ratio — 10.30 m³/t.
Total for the sec­tion: 5,475.28 thou­sand m³; strip­ping ratio — 9.52 m³/t.

“Kreminna” Sec­tion
Seam IV: over­bur­den vol­ume — 4,765.57 thou­sand m³; strip­ping ratio — 13.39 m³/t.
Seam V: over­bur­den vol­ume — 2,160.80 thou­sand m³; strip­ping ratio — 8.22 m³/t.
Total for the sec­tion: 6,926.37 thou­sand m³; strip­ping ratio — 11.19 m³/t.

Total over­bur­den vol­ume: 12,401.65 thou­sand m³; aver­age strip­ping ratio — 10.38 m³/t.

Aquifers

The hydro­ge­o­log­i­cal con­di­tions of the Ilnyt­sia deposit are com­plex. Aquifers asso­ci­at­ed with weak­ly cement­ed and loose sands, tuffites, tuffs, sand­stones, and andesites occur in the roof and floor of the coal seams. The aquifers are split and local­ly iso­lat­ed; the most water-bear­ing rocks are sands and tuffs.
With­in the deposit, an over-seam allu­vial aquifer and aquifers asso­ci­at­ed with the coal seams have been iden­ti­fied. At the “Kar’y­er­na” sec­tor, the over-seam allu­vial aquifer, the under-seam aquifer of Seam I, and the over-seam aquifers of Seam II are dis­tin­guished. At the “Kreminna” sec­tor, the over-seam allu­vial aquifer, the over-seam aquifers of Seams IV and V, and the under-seam aquifer of Seam V are iden­ti­fied.

Water inflow, drainage and dewatering

The max­i­mum pre­dict­ed water inflow into the quar­ry is 75 m³/h. To col­lect water in the low­er part of the pit floor, a drainage sump with drainage ditch­es is pro­vid­ed. Water pump­ing is car­ried out by two D320-50 pumps with auto­mat­ic turn­ing on and off based on lev­el sen­sor read­ings.
The pumped water is deliv­ered via a pipeline to a set­tling pond with a capac­i­ty of 1,200 m³. The treat­ment of quar­ry water from sus­pend­ed solids and petro­le­um prod­ucts takes place in two stages: pre­lim­i­nary set­tling in the sump and sub­se­quent purifi­ca­tion in the set­tling pond. After treat­ment, the water is dis­charged into the local hydro­graph­ic net­work, and part of it is used for tech­ni­cal needs. Lab­o­ra­to­ry qual­i­ty con­trol of return water and peri­od­ic clean­ing of the set­tling pond from accu­mu­lat­ed sed­i­ment are pro­vid­ed.

Land plot information

To date, land plots with an area of 3.0809 ha (cadas­tral num­ber 2121984500:07:001:0069) and 0.5219 ha (cadas­tral num­ber 2121984500:07:001:0070) have been suc­cess­ful­ly reg­is­tered, fol­low­ing the per­mit grant­ed by the Ilnyt­sia Vil­lage Coun­cil to draft land man­age­ment plans in accor­dance with the Land Code and the Sub­soil Code of Ukraine. In addi­tion, the reg­is­tra­tion of a prospec­tive 17.0 ha land plot (cadas­tral num­ber 2121984500:07:001:0185) has been secured, lay­ing the foun­da­tion for the next stage of deposit devel­op­ment and obtain­ing per­mis­sion to remove the fer­tile soil lay­er.