求翻译：货到交货地点，买方与卖方一起把砂金在双方认可提炼厂。提炼及化验鉴定；达到质量纯度，买方在4个工作日内付给卖方全额货款。是什么意思？

Goods to the place of delivery, the buyer and seller mutually agreed with the gold dust in the refinery. Refining and laboratory identification; meet quality purity, four working days of the buyer the full purchase price paid to the seller.

goods to the place of delivery, the buyer and the seller come together to bring the two sides recognized refineries in placer gold. Refining and laboratory accreditation; to meet the quality purity, the buyer to pay the seller within 4 business days for the full purchase price.

正在翻译，请等待...

Place cash on delivery, the buyer and seller together both sides recognized gold refinery. Refined and laboratory identification of quality purity, the buyer in full purchase price paid to the seller within 4 business days.

Goods to the place of delivery, the buyer and seller mutually agreed with the gold dust in the refinery. Refining and laboratory identification; meet quality purity, four working days of the buyer the full purchase price paid to the seller.