New Zealand exports of slag, ash and residues containing metals, arsenic or their compounds

Exports: All goods purchased by overseas residents from New Zealand residents. Merchandise exports (excluding re-exports) are goods of domestic origin exported from New Zealand to another country.
Re-exports: Merchandise exports that were earlier imported into New Zealand and have less than 50 percent New Zealand content by value.
Free on board (fob): The value of exported goods at New Zealand ports before export.
Country of destination: The country of final destination for exported goods.

http://datainfoplus.stats.govt.nz/Item/nz.govt.stats/6ed114da-3571-40d4-a89f-932068a4c753

Aggregated Harmonised System (HS) codes may include confidential 10 digit codes, in which case the summed data will exclude the confidential value(s).
https://www.stats.govt.nz/about-us/legislation-policies-and-guidelines/trade-confidentiality/

This specific dataset combines all countries of destination.

All confidential HS codes, or HS codes not traded for the month have been excluded.

Exports specifically exclude:
- goods consigned to New Zealand forces overseas or diplomatic representatives overseas
- goods consigned for modification or repair
- currency transactions in gold, silver, current coin
- consignments valued under $1,000
- second-hand clothing for foreign aid projects replacements, short-shipped or short-packed goods
- returnable containers and returnable samples
- aircraft parts for use in New Zealand aircraft overseas and unserviceable parts removed from foreign aircraft and being returned overseas
- temporary trade items and tourist effects leaving New Zealand.

From January 2017, Stats NZ compiled overseas merchandise trade (OMT) data using the Harmonised System classification (HS2017). They used HS2017 in OMT from January 2017, and before January 2017, HS2012 applies.
The classification changes mean that data users need to take care when analysing time-series data. As with the change from HS2012 to HS2017, a number of new codes were introduced and a number of codes became obsolete. These changes took effect from the January 2017 month.

At URL provided, download all aggregated monthly import files from '2019 Exports HS10.zip' to '2010 Exports HS10.zip'. For processing purposes, Figure.NZ re-organised this data into one large spreadsheet and built two pivot tables. These pivot tables are annual. They each cover different levels of granularity of trade data (4-digit codes, and 2-digit codes).

Overseas Merchandise Trade statistics provide statistical information on the importing and exporting of merchandise goods between New Zealand and other countries. Merchandise trade includes goods which add to or subtract from the material resources in New Zealand as a result of their movement in or out of the country. Data is obtained from export and import entry documents lodged with the New Zealand Customs Service (NZCS).

The purpose of Overseas Merchandise Trade statistics is to provide statistical information on the importing and exporting of merchandise goods between New Zealand and other countries

Stats NZ obtain data from export and import entry documents lodged with New Zealand Customs Service (NZCS).
They convert export values provided in foreign currencies by NZCS to New Zealand dollars (NZD), using weekly exchange rates when the statistics are compiled. For exports, a rise in the NZD has a downward influence on prices and, as a consequence, quantities and values reduce.