“Published Lump Premium” (or “PLP”) means the average of all published reference Midpoint prices for Platts IO Spot Lump Premium 62.5% CFR China (IOCLP00), in US$ per dmtu, as published daily in Platts’ publication Steel Markets Daily during the Quotation Period defined in this Agreement.
先将句子拆分逐步理解，再合并起来就好理解了。
首先，《北京铁矿石交易中心铁矿石现货浮动定价交易实施办法》（2015.10）针对“Lump Premium”的定义作了描述：
“块矿溢价：指买卖块矿时，买卖双方会员在依据粉矿指数确定的价格基础上，另行增加的金额。块矿溢价可以选择固定值溢价或指数溢价两种形式。块矿指数溢价为指数机构发布的结算周期内块矿溢价指数平均值。
Lump Premium (LP) refers to additional premiums to be applied to the index-based price for fines. LP is quoted as a fixed or and index. Index LP means the average of LP index price published by index institution during Settlement Period.”
此外，结算周期指的是会员在申报时指定的某一时间周期，以该周期作为计算价格指数均值的时间范围。因此，在此句中结算周期应为“Quotation Period defined in this Agreement”。
其次是理解“Platts IO Spot Lump Premium 62.5% CFR China (IOCLP00)”的含义，该部分内容可通过S&P Global官网提供的信息理解：
“The Platts spot iron ore lump premium assessment (IOCLP00) is of the premium a lump cargo commands over the price of fines as defined by the Platts 62% Fe Iron Ore Index, or IODEX. This premium is assessed on a US dollar per dry metric ton unit CFR Qingdao basis, which is applied over the IODEX assessments.
铁矿石块矿现货溢价（IOCLP00）是块矿船货相对粉矿价格（62%品位铁矿石指数，IODEX）的溢价。该溢价估价的单位为美元/干吨，CFR青岛，与IODEX评估一致。”
此处使用的是普氏指数，即普氏能源资讯（Platts）对现货市场出售并通过海路进口至中国的铁矿石进行每日交易价格评估，该基准估价基于含铁量为62%的标准规格铁矿石，并用作其他品位铁矿石定价的指数，命名为普氏IODEX。
铁矿石的品位指的是铁矿石中铁元素的质量分数，通俗来说就是含铁量，因此，此句中的62.5%指的就是62.5%品位或62.5%含铁量。
因此，“Platts IO Spot Lump Premium 62.5% CFR China (IOCLP00), in US$ per dmtu”对应的意思就是“普氏62.5%含量铁矿石块矿现货溢价（IOCLP00），单位为美元/干公吨度，CFR中国”。
最后，“Platts’ publication Steel Markets Daily”指的是“the only publication that houses both Platts IODEX and TSI 62% Fe iron ore price benchmarks, as well as over 80 key price assessments published daily and weekly for the steel, coking coal, ferrous scrap and iron ore markets.”
该刊物可以将其译为“《普氏钢铁市场日报》”，每日提供有关炼钢原材料的市场动态和评论、专家分析以及S&P Global Platts最新的基准价格评估。
基于上述分析，
“Published Lump Premium” (or “PLP”) means the average of all published reference Midpoint prices for Platts IO Spot Lump Premium 62.5% CFR China (IOCLP00), in US$ per dmtu, as published daily in Platts’ publication Steel Markets Daily during the Quotation Period defined in this Agreement.
可译为：
“公布的块矿溢价”（或“PLP”）指在本协议规定的报价期间内，《普氏钢铁市场日报》（Steel Markets Daily）每日公布的普氏62.5%含量铁矿石现货块矿溢价（IOCLP00）（CFR中国）的所有公布参考中点价格的平均值，单位为美元/干公吨度。
参考：
百度百科；
《北京铁矿石交易中心铁矿石现货浮动定价交易实施办法》（2015.10）；
http://www.p5w.net/stock/lzft/hyyj/201103/P020110301575073340540.pdf
